DOC: Pandas.Series.drop docstring PR02 (#27976)
- [x] addresses, but **does not fully close**, #27976 
- [x] tests added / passed - I didn't run the full `pytest` suite on the actual code, but rather re-ran:
```
./scripts/validate_docstrings.py pandas.Series.drop --errors=PR02
```
to confirm that the docstring formatting passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] ~whatsnew entry~ - not needed

First PR to pandas, which has been my go-to tool for many years now! Thanks, maintainers! 🎉 
