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[3.14] gh-109070: Document that get_context in multiprocessing have side effect (GH-136341) (GH-136343)

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gh-109070: Document that get_context in multiprocessing have side effect (GH-136341)

Document that get_context in multiprocessing have side effect
(cherry picked from commit 77a8bd29da)

Co-authored-by: AN Long <aisk@users.noreply.github.com>
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Doc/library/multiprocessing.rst
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@ -1118,7 +1118,9 @@ Miscellaneous
Return a context object which has the same attributes as the
:mod:`multiprocessing` module.
If *method* is ``None`` then the default context is returned.
If *method* is ``None`` then the default context is returned. Note that if
the global start method has not been set, this will set it to the
default method.
Otherwise *method* should be ``'fork'``, ``'spawn'``,
``'forkserver'``. :exc:`ValueError` is raised if the specified
start method is not available. See :ref:`multiprocessing-start-methods`.
@ -1129,10 +1131,10 @@ Miscellaneous
Return the name of start method used for starting processes.
If the start method has not been fixed and *allow_none* is false,
then the start method is fixed to the default and the name is
returned. If the start method has not been fixed and *allow_none*
is true then ``None`` is returned.
If the global start method has not been set and *allow_none* is
``False``, then the start method is set to the default and the name
is returned. If the start method has not been set and *allow_none* is
``True`` then ``None`` is returned.
The return value can be ``'fork'``, ``'spawn'``, ``'forkserver'``
or ``None``. See :ref:`multiprocessing-start-methods`.