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[3.14] gh-115634: document ProcessPoolExecutor max_tasks_per_child bug (GH-140897) (#143302)

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gh-115634: document ProcessPoolExecutor max_tasks_per_child bug (GH-140897)
(cherry picked from commit 04899b8539)

Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
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Doc/library/concurrent.futures.rst
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@ -379,6 +379,11 @@ in a REPL or a lambda should not be expected to work.
default in absence of a *mp_context* parameter. This feature is incompatible
with the "fork" start method.
.. note::
Bugs have been reported when using the *max_tasks_per_child* feature that
can result in the :class:`ProcessPoolExecutor` hanging in some
circumstances. Follow its eventual resolution in :gh:`115634`.
.. versionchanged:: 3.3
When one of the worker processes terminates abruptly, a
:exc:`~concurrent.futures.process.BrokenProcessPool` error is now raised.