DOC: Remove deprecated delim_whitespace from user guide
- [x] closes #58488
- [ ] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [ ] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [ ] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) to new arguments/methods/functions.
- [ ] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

Thanks @Aloqeely  Can this be backported @mroeschke? @meeseeksdev backport 2.2.x Awww, sorry Aloqeely you do not seem to be allowed to do that, please ask a repository maintainer. Hmm I don't think it's super critical that this documentation is backported It isn't critical, but if this isn't going to be backported then users viewing the stable docs won't know this option is deprecated
https://github.com/pandas-dev/pandas/issues/58488#issuecomment-2089150285