DOC: Fixing SS02 errors as per #25113
Some of the SS02 error mentioned are not because of methods but of docstring.
For example, in the first SS02 error pandas/tseries/offsets.py has no method named normalize.

- [X] Closes #25113 
- [ ] tests added / passed
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry
