DOC: Remove unnecessary parentheses in :func: & :meth: role

[mattwang44]

• closes DOC: Remove unnecessary :func: & :meth: parentheses #59662
• Tests added and passed if fixing a bug or adding a new feature N/A
• All code checks passed.
• Added type annotations to new arguments/methods/functions. N/A
• Added an entry in the latest doc/source/whatsnew/vX.X.X.rst file if fixing a bug or adding a new feature. N/A

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The func & meth role's parentheses are unnecessary as Sphinx will add them to the rendered output.

.. bad
:func:`read_csv()`

.. good
:func:`read_csv`

We're introducing a new rule to the sphinx-lint (issue & PR) and, since sphinx-lint utilizes pandas doc in the CI, we'd like to also fix the issue in pandas.

[mroeschke]

Thanks @mattwang44 great to see a new sphinx-lint rule for this in the future