DOC: Remove absolute urls from the docs
- [x] closes #32529
- [ ] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Hi @jorisvandenbossche , I have updated my PR, it would be great if you can review once again. Thanks. Hi @jorisvandenbossche , I have made the changes, it would be great if you can look into once again. Thanks.  Sorry for the poor issue description from my side @ArkadeepAdhikari. Looks good, there is just one case that needs to be reverted.

Also, if you can add to `ci/code_checks.sh` a check to make sure the pattern `pandas.pydata.org` doesn't exist in `doc/source` anymore that would be very useful. Hi @datapythonista, should I be adding the check to not keep `pandas.pydata.org` in `doc/source`? Some of the files like the one I would be reverting are in the same path (for example: `doc/source/whatsnew/v0.21.0.rst`) Good point. Let's leave it for later, as we'll need to think whether it's worth validating it and how. > Also, if you can add to ci/code_checks.sh a check to make sure the pattern pandas.pydata.org doesn't exist in doc/source anymore that would be very useful.

Since there are actually cases where we have this url in doc/source (several ones we reverted here in the PR), and given that there were not that much occurences to fix, I personally don't think it is worth the effort to make a code check for this Hi @datapythonista, @jorisvandenbossche, thanks for the clarifications. I have reverted the final case. Please take a look again. Thanks. Hi @datapythonista, I have updated my PR, please feel free to review once again. Thanks @ArkadeepAdhikari ! Thanks for reviewing @jorisvandenbossche, @datapythonista!