[3.13] gh-125025: `_thread` docs: fix/update the *caveats* list (GH-125026)#125032

Yhg1s merged 1 commit intopython:3.13python/cpython:3.13from

miss-islington:backport-1e098dc-3.13miss-islington/cpython:backport-1e098dc-3.13Copy head branch name to clipboard