DOC: Added check for standard
- [ ] xref #32316
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

This is my first time contributing, if I made any errors please tell me! I tried to continue what @joybhallaa  was working on. I made a check to see which files are not using the standard documentation.