Remove incorrect docs about confcutdir being a config option

Fix #9210

Author: nicoddemus

changelog/9210.doc.rst

@@ -0,0 +1 @@
+Remove incorrect docs about ``confcutdir`` being a configuration option: it can only be set through the ``--confcutdir`` command-line option.

doc/en/reference/reference.rst

@@ -1196,19 +1196,8 @@ passed multiple times. The expected format is ``name=value``. For example::
    variables, that will be expanded. For more information about cache plugin
    please refer to :ref:`cache_provider`.
 
-
-.. confval:: confcutdir
-
-   Sets a directory where search upwards for ``conftest.py`` files stops.
-   By default, pytest will stop searching for ``conftest.py`` files upwards
-   from ``pytest.ini``/``tox.ini``/``setup.cfg`` of the project if any,
-   or up to the file-system root.
-
-
 .. confval:: console_output_style
 
-
-
    Sets the console output style while running tests:
 
    * ``classic``: classic pytest output.