DOC: Remove pandas. prefix from See Also section in Series #23659
- [x] closes #23659
- [x] tests added / passed
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

Cleaned up so that `./scripts/validate_docstrings.py --prefix=pandas.Series --errors=SA05` does not return any cases.