[3.14] gh-139837: Document attributes of objects recorded by warnings.catch_warnings...

[3.14] gh-139837: Document attributes of objects recorded by warnings.catch_warnings (GH-139893) (#151473)

* gh-139837: Document attributes of objects recorded by warnings.catch_warnings (GH-139893)
(cherry picked from commit 47b7dc788c9bcf3d5ea69a2ea0aed3d5883647a8)

Co-authored-by: Aniket <148300120+Aniketsy@users.noreply.github.com>
Co-authored-by: Victor Stinner <vstinner@python.org>
* Apply suggestions from code review

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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Co-authored-by: Aniket <148300120+Aniketsy@users.noreply.github.com>
Co-authored-by: Victor Stinner <vstinner@python.org>
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>