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[3.14] gh-135730: Clarify multiprocessing.Queue close() documentation (GH-136803) (GH-136806)

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gh-135730: Clarify multiprocessing.Queue close() documentation (GH-136803)

Add a copy of the text from SimpleQueue.close()

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(cherry picked from commit f575588ccf)

Co-authored-by: aggshruti99 <aggshruti99@gmail.com>
Co-authored-by: Petr Viktorin <encukou@gmail.com>
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Doc/library/multiprocessing.rst
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@ -936,8 +936,13 @@ For an example of the usage of queues for interprocess communication see
.. method:: close()
Indicate that no more data will be put on this queue by the current
process. The background thread will quit once it has flushed all buffered
Close the queue: release internal resources.
A queue must not be used anymore after it is closed. For example,
:meth:`~Queue.get`, :meth:`~Queue.put` and :meth:`~Queue.empty`
methods must no longer be called.
The background thread will quit once it has flushed all buffered
data to the pipe. This is called automatically when the queue is garbage
collected.