DOC: Moved the sort_values doc from generic.py to frame.py
Hello,

this is my first pull request to pandas and on GitHub in general.
While looking into an issue in sort_values in frame.py I saw the
TODO about moving the sort_values doc and did it.

Cheers, Felix

- [ ] closes #xxxx (Replace xxxx with the GitHub issue number)
- [ ] [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. Could you build the docs locally and share a screenshot of how the docs look after this change? https://pandas.pydata.org/pandas-docs/stable/development/contributing_documentation.html Thanks for your PR - looks like this is no longer active (no activity in > 1 month), so I'll close it for now

If you still interested in working on this and addressing the review comments, please let us know and we can reopen