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[3.13] gh-141617: clarify concurrent.futures.ThreadPoolExecutor deadlock example (GH-141620) (#145687)

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gh-141617: clarify `concurrent.futures.ThreadPoolExecutor` deadlock example (GH-141620)

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(cherry picked from commit 171133aa84)

Co-authored-by: Yashraj <yashrajpala8@gmail.com>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
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Doc/library/concurrent.futures.rst
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@ -147,7 +147,9 @@ And::
print(f.result())
executor = ThreadPoolExecutor(max_workers=1)
executor.submit(wait_on_future)
future = executor.submit(wait_on_future)
# Note: calling future.result() would also cause a deadlock because
# the single worker thread is already waiting for wait_on_future().
.. class:: ThreadPoolExecutor(max_workers=None, thread_name_prefix='', initializer=None, initargs=())