Add missing relnotes

Author: marcandre

relnotes/v1.47.0.md

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+### New features
+
+* [#387](https://github.com/rubocop/rubocop-ast/pull/387): Add `Node#any_sym_type?` to match `sym` and `dsym` types. ([@dvandersluis][])
+* [#328](https://github.com/rubocop/rubocop-ast/pull/328): Add `Node#any_str_type?` to match `str`, `dstr`, and `xstr` types. ([@dvandersluis][])
+
+[@dvandersluis]: https://github.com/dvandersluis

relnotes/v1.47.1.md

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+### Bug fixes
+
+* [#386](https://github.com/rubocop/rubocop-ast/pull/386): Fix parsing of node patterns that match against the empty string. ([@earloapin][])
+
+[@earloapin]: https://github.com/earloapin