DOC: Remove references to `bfill`, `ffill`, `pad`, and `backfill` in `limit_direction`
Picked up issue #57092. This removes references to `bfill`, `ffill`, `pad`, `backfill` from `limit_direction` as they aren't supported. Also references `bfill` and `ffill` in the "See Also" section. Up to date with latest commit.

- [X] closes #57092 
- [ ] [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 @TechnoShip123 