[3.13] Fix typo in ``Doc/library/functions.rst`` (GH-125327) (#125333)

Fix typo in ``Doclibrary/functions.rst`` (GH-125327)
(cherry picked from commit 76b29d271b3132bf8e13bc724f10be8c630057ba)

Co-authored-by: Rafael Fontenelle <rffontenelle@users.noreply.github.com>