[3.12] gh-101100: Fix Sphinx warnings in `Doc/library/weakref.rst` (GH-109881)#109884

Yhg1s merged 1 commit intopython:3.12python/cpython:3.12from

hugovk:backport-7c61a36-3.12hugovk/cpython:backport-7c61a36-3.12Copy head branch name to clipboard