DOC: Fix capitalization of the word pandas in the docs
- [x] closes #32316 
- [x] tests added / passed
- [x] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

As stated in the referred issue, _pandas_ reference in the docs should be standardised to pandas, not *pandas* or Pandas.

I've only changed the references in `doc/source/development/*.rst` for now, to see if the changes are okay or not
@datapythonista , sure I'll add the checks and update the required changes, I should add the checks in a separate PR right?  > @datapythonista , sure I'll add the checks and update the required changes, I should add the checks in a separate PR right?

You can add them here or in a separate PR, as you prefer. Not sure how many cases will still fail, if there are lots, probably better to open a new PR, so the PR is not so big. @joybhallaa do you have time to add the checks and fix the CI? Yes! Thanks @joybhallaa 