gh-150175: Fix news entry class reference

Author: saisneha196

Misc/NEWS.d/next/Library/2026-05-21-11-25-58.gh-issue-150175.8H4Caz.rst

@@ -1,4 +1,3 @@
-Fix race condition in :class:`unittest.mock.ThreadingMock` where concurrent
-calls could lose increments to ``call_count`` and other attributes. Fixed by
-overriding ``_increment_mock_call`` in
-:class:`~unittest.mock.ThreadingMixin` with the existing lock.
+Fix race condition in :class:`unittest.mock.ThreadingMock` where
+concurrent calls could lose increments to ``call_count`` and other
+attributes due to a missing lock in ``_increment_mock_call``.