DOCS: fix docstring validation errors for pandas.Series #59595
Fixes the following issues from #59595 

-i "pandas.Series.sparse.fill_value SA01" \
-i "pandas.Series.str.match RT03" \ 

- [x] Partially addresses #59595 
- [ ] [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
- [x] 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.

I am a new contributor looking to make my first PR. I have fixed the merge conflict with the previously added solution for sparse.fill_value docstring by keeping both our additions to the "See Also" section, and have added the extended description to the str.match docstring fixing that docstring. This pull request is stale because it has been open for thirty days with no activity. Please [update](https://pandas.pydata.org/pandas-docs/stable/development/contributing.html#updating-your-pull-request) and respond to this comment if you're still interested in working on this. Thanks for the pull request, but it appears to have gone stale. If interested in continuing, please merge in the main branch, address any review comments and/or failing tests, and we can reopen.