DOC: remove savefig references from the docs v0.7.3
- [x] closes #27971 
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

@datapythonista removed those references. In the future we should make sure every .rst file is independent of each other