fix still broken ref in NEWS entry

Author: Changaco

Misc/NEWS.d/next/Library/2026-04-21-22-19-35.gh-issue-148242.unTO3m.rst

@@ -1,4 +1,4 @@
-The built-in ``defaultdict.__missing__`` method no longer exists. A custom
-:meth:`~object.__missing__` method should no longer insert the generated value
-into the dictionary, as this is done by the new :meth:`defaultdict.__getitem__`
-method. defaultdict is now safe to use with :term:`free threading`.
+The built-in ``defaultdict.__missing__`` method no longer exists. A custom :meth:`~object.__missing__`
+method should no longer insert the generated value into the dictionary, as this is done by the new
+:meth:`~collections.defaultdict.__getitem__` method. defaultdict is now safe to use with
+:term:`free threading`.