[3.13] Docs: point uu module users to the "uu" encoding (GH-153657) (#154024)

(cherry picked from commit a1d5804)

Co-authored-by: Ondřej Hošek <ondra.hosek@gmail.com>
Co-authored-by: Stan Ulbrych <stan@python.org>

Author: 3 people

Doc/library/uu.rst

@@ -11,5 +11,9 @@ This module is no longer part of the Python standard library.
 It was :ref:`removed in Python 3.13 <whatsnew313-pep594>` after
 being deprecated in Python 3.11.  The removal was decided in :pep:`594`.
 
+Encoding and decoding in the uu format can instead be achieved using
+:func:`codecs.encode` and :func:`codecs.decode`, specifying ``"uu"``
+as the encoding.
+
 The last version of Python that provided the :mod:`!uu` module was
 `Python 3.12 <https://docs.python.org/3.12/library/uu.html>`_.