Doc: fix ES01 for pandas.CategoricalDtype
All ES01 Errors resolved in the following cases:

1. scripts/validate_docstrings.py --format=actions --errors=ES01 pandas.CategoricalDtype

- [x]  xref #57440
- [x] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [x] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [ ] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) to new arguments/methods/functions.
- [ ] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

pre-commit.ci autofix

 Thanks for the effort here, but it was decided that ES01 is not going to be enforced so closing. Happy to have PRs on other doc issues!