DOC: Corrected Out-of-date list of sort algorithms
Reference Issues/PRs
Fixes: #38287

Implemented changes:
Changed the docstring of all the methods using np.sort as it now includes one additional stable algorithm

can you also update the tests in pandas/tests/series/methods/test_sort_index.py to use stable (where we use mergesort), just parameterize a test is prob good enough. > can you also update the tests in pandas/tests/series/methods/test_sort_index.py to use stable (where we use mergesort), just parameterize a test is prob good enough.

Done :) LGTM, mind fixing up the merge conflict @DonPablo99?  can you merge master and update thanks @DonPablo99 