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[3.12] gh-66944: Note that the contextlib.closing example is for illustrative purposes (GH-112198) (#114458)

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Doc/library/contextlib.rst
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@ -182,6 +182,14 @@ Functions and classes provided:
without needing to explicitly close ``page``. Even if an error occurs,
``page.close()`` will be called when the :keyword:`with` block is exited.
.. note::
Most types managing resources support the :term:`context manager` protocol,
which closes *thing* on leaving the :keyword:`with` statment.
As such, :func:`!closing` is most useful for third party types that don't
support context managers.
This example is purely for illustration purposes,
as :func:`~urllib.request.urlopen` would normally be used in a context manager.
.. function:: aclosing(thing)