DOC: Fix indendation in docstring sort_values 'by' parameter

[stijnvanhoey]

• closes #xxxx (Replace xxxx with the GitHub issue number)
• Tests added and passed if fixing a bug or adding a new feature
• All code checks passed.
• Added type annotations 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.

Current version looks like:

Parameters
----------
        by : str or list of str
            Name or list of names to sort by.

            - if `axis` is 0 or `'index'` then `by` may contain index
              levels and/or column labels.
            - if `axis` is 1 or `'columns'` then `by` may contain column
              levels and/or index labels.
axis : {0 or 'index', 1 or 'columns'}, default 0
     Axis to be sorted.

[mroeschke]

How does this render in the docs?

IMO it looks fine currently? https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.sort_values.html

[stijnvanhoey]

How does this render in the docs?

Indeed, this look good in the sphinx rendered version. But when I checked the text-version (inside notebook or ipython), it looks like:

this PR fixes the latter.

[mroeschke]

this PR fixes the latter.

Ah okay. Could you double check the sphinx rendered version looks okay too (screenshot of a local rendered doc is fine)?

[stijnvanhoey]

Good point, I checked and seems ok

[mroeschke]

Thanks @stijnvanhoey