[3.14] gh-147965: Add shutdown() to multiprocessing.Queue excluded methods (GH-147970) (#148416)

gh-147965: Add shutdown() to multiprocessing.Queue excluded methods (GH-147970)

The multiprocessing.Queue documentation states it implements all
methods of queue.Queue except task_done() and join(). Since
queue.Queue.shutdown() was added in Python 3.13,
multiprocessing.Queue also does not implement it. Update the docs
to include shutdown() in the list of excluded methods.
(cherry picked from commit 22290ed)

Co-authored-by: WYSIATI <chester.lee.cold@gmail.com>

Author: miss-islington

Doc/library/multiprocessing.rst

@@ -932,7 +932,8 @@ For an example of the usage of queues for interprocess communication see
    standard library's :mod:`queue` module are raised to signal timeouts.
 
    :class:`Queue` implements all the methods of :class:`queue.Queue` except for
-   :meth:`~queue.Queue.task_done` and :meth:`~queue.Queue.join`.
+   :meth:`~queue.Queue.task_done`, :meth:`~queue.Queue.join`, and
+   :meth:`~queue.Queue.shutdown`.
 
    .. method:: qsize()