DOC: Fix docstrings errors SEM and GET_GROUP
- [ ] part of https://github.com/pandas-dev/pandas/issues/60365


@Axeldnahcram - can you merge main and resolve the conflicts. @rhshadrach done. I also have a small question. I have had some issues running the formatting/cleaning steps of precommit/linting and I was wondering if we should not include it in the Making a [pull request contribution guideline ](https://pandas.pydata.org/docs/development/contributing.html#id10)
Maybe it is intended ? Or maybe I simply missed a readme/documentation somewhere. Let me know what you think Thanks @Axeldnahcram 