DOC: Styler errors PR08 and PR09
-  closes #28656
-  tests added/ passed - Checked with 
```
./scripts/validate_docstrings.py pandas.io.formats.style.Styler --errors=PR08,PR09
```
- passes `black pandas`
- passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- whatsnew entry - not needed
