DOC: Move couple of deprecations whatsnew to correct section
- [x] closes #30927
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

Also corrected issue number to #30610 for `pd.datetime` deprecation which was a new issue created and linked to original issue but not updated in the whats new Thanks @ryankarlos 