fix some dosctring-RT02-error
- [x] some #49968 
- [ ] [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
- [ ] 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.

Actually I'm not sure they're right, if someone could review and comment this, I will continue to fix the issues.
This is the functions above:

pandas.io.formats.style.Styler.format
pandas.io.formats.style.Styler.format_index
pandas.io.formats.style.Styler.relabel_index
pandas.Index.drop
pandas.Index.drop_duplicates
pandas.Index.insert
pandas.Index.repeat
pandas.Index.map
pandas.Index.intersection thx @luke396 