5.2.1: sphinx warnings `reference target not found`

[kloczek]

On building my packages I'm using sphinx-build command with -n switch which shows warmings about missing references. These are not critical issues.
Here is the output with warnings:

+ /usr/bin/sphinx-build -n -T -b man docs build/sphinx/man
Running Sphinx v4.5.0
making output directory... done
building [mo]: targets for 0 po files that are out of date
building [man]: all manpages
updating environment: [new config] 24 added, 0 changed, 0 removed
reading sources... [100%] versioning
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
writing... pynamodb.1 { quickstart tutorial indexes batch updates conditional polymorphism attributes transaction optimistic_locking rate_limited_operations local signals examples settings low_level awsaccess logging contributing release_notes versioning upgrading_unicodeset api } /home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/docs/tutorial.rst:298: WARNING: py:func reference target not found: update_item
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/docs/tutorial.rst:298: WARNING: py:func reference target not found: update
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/docs/transaction.rst:126: WARNING: py:class reference target not found: pynamodb.expressions.condition.Condition
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/docs/transaction.rst:140: WARNING: py:class reference target not found: pynamodb.expressions.condition.Condition
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/docs/transaction.rst:157: WARNING: py:class reference target not found: pynamodb.expressions.condition.Condition
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/docs/transaction.rst:174: WARNING: py:class reference target not found: pynamodb.expressions.update.Action
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/docs/transaction.rst:175: WARNING: py:class reference target not found: pynamodb.expressions.condition.Condition
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/docs/transaction.rst:210: WARNING: py:class reference target not found: pynamodb.exceptions.InvalidStateError
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/docs/transaction.rst:218: WARNING: py:exc reference target not found: pynamodb.exceptions.TransactWriteError
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/docs/transaction.rst:219: WARNING: py:exc reference target not found: pynamodb.exceptions.TransactGetError
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/docs/transaction.rst:220: WARNING: py:exc reference target not found: pynamodb.exceptions.InvalidStateError
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/docs/transaction.rst:220: WARNING: py:class reference target not found: pynamodb.models._ModelFuture
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/models.py:docstring of pynamodb.models.Model.batch_get:: WARNING: py:class reference target not found: pynamodb.models._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/models.py:docstring of pynamodb.models.Model.batch_write:: WARNING: py:class reference target not found: pynamodb.models.BatchWrite
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/models.py:docstring of pynamodb.models.Model.batch_write:: WARNING: py:class reference target not found: pynamodb.models._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/models.py:docstring of pynamodb.models.Model.from_raw_data:: WARNING: py:class reference target not found: pynamodb.models._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/models.py:docstring of pynamodb.models.Model.get:: WARNING: py:class reference target not found: pynamodb.models._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/models.py:docstring of pynamodb.models.Model.get:: WARNING: py:exc reference target not found: ModelInstance.DoesNotExist
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/models.py:docstring of pynamodb.models.Model.query:: WARNING: py:class reference target not found: pynamodb.models._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/models.py:docstring of pynamodb.models.Model.refresh:: WARNING: py:exc reference target not found: ModelInstance.DoesNotExist
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/models.py:docstring of pynamodb.models.Model.scan:: WARNING: py:class reference target not found: pynamodb.models._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/models.py:docstring of pynamodb.models.Model.update:: WARNING: py:exc reference target not found: ModelInstance.DoesNotExist
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.Attribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.Attribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.Attribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.BinaryAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.BinaryAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.BinaryAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.BinarySetAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.BinarySetAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.BinarySetAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.BooleanAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.BooleanAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.BooleanAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.JSONAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.JSONAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.JSONAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.ListAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.NullAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.NullAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.NullAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.NumberAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.NumberAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.NumberAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.NumberSetAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.NumberSetAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.NumberSetAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.TTLAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.TTLAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.TTLAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.UTCDateTimeAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.UTCDateTimeAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.UTCDateTimeAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.UnicodeAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.UnicodeAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.UnicodeAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.UnicodeSetAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.UnicodeSetAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.UnicodeSetAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.VersionAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.VersionAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/attributes.py:docstring of pynamodb.attributes.VersionAttribute:: WARNING: py:class reference target not found: pynamodb.attributes._T
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/indexes.py:docstring of pynamodb.indexes.Index.count:: WARNING: py:class reference target not found: pynamodb.expressions.condition.Condition
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/indexes.py:docstring of pynamodb.indexes.Index.count:: WARNING: py:class reference target not found: pynamodb.expressions.condition.Condition
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/indexes.py:docstring of pynamodb.indexes.Index.query:: WARNING: py:class reference target not found: pynamodb.expressions.condition.Condition
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/indexes.py:docstring of pynamodb.indexes.Index.query:: WARNING: py:class reference target not found: pynamodb.expressions.condition.Condition
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/indexes.py:docstring of pynamodb.indexes.Index.query:: WARNING: py:class reference target not found: pynamodb.indexes._M
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/indexes.py:docstring of pynamodb.indexes.Index.scan:: WARNING: py:class reference target not found: pynamodb.expressions.condition.Condition
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/indexes.py:docstring of pynamodb.indexes.Index.scan:: WARNING: py:class reference target not found: pynamodb.indexes._M
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/transactions.py:docstring of pynamodb.transactions.TransactGet.get:: WARNING: py:class reference target not found: pynamodb.transactions._M
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/transactions.py:docstring of pynamodb.transactions.TransactGet.get:: WARNING: py:class reference target not found: pynamodb.models._ModelFuture
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/transactions.py:docstring of pynamodb.transactions.TransactGet.get:: WARNING: py:class reference target not found: pynamodb.transactions._M
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/connection/base.py:docstring of pynamodb.connection.Connection.session:: WARNING: py:class reference target not found: botocore.session.Session
/home/tkloczko/rpmbuild/BUILD/PynamoDB-5.2.1/pynamodb/connection/table.py:docstring of pynamodb.connection.table.TableConnection.get_meta_table:: WARNING: py:class reference target not found: pynamodb.connection.base.MetaTable
done
build succeeded, 74 warnings.

You can peak on fixes that kind of issues in other projects
latchset/jwcrypto#289
click-contrib/sphinx-click@abc31069
latchset/jwcrypto#289
RDFLib/rdflib-sqlalchemy#95