[3.13] Mention the "context manager" keyword in concurrent.futures documentation (GH-130976) (#137811)

Mention the "context manager" keyword in concurrent.futures documentation (GH-130976)
(cherry picked from commit 095bc775ec)

Co-authored-by: Jakub Stasiak <jakub@stasiak.at>
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Miss Islington (bot) 2025-08-15 16:11:04 +02:00 committed by GitHub
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@ -92,10 +92,10 @@ Executor Objects
executor has started running will be completed prior to this method
returning. The remaining futures are cancelled.
You can avoid having to call this method explicitly if you use the
:keyword:`with` statement, which will shutdown the :class:`Executor`
(waiting as if :meth:`Executor.shutdown` were called with *wait* set to
``True``)::
You can avoid having to call this method explicitly if you use the executor
as a :term:`context manager` via the :keyword:`with` statement, which
will shutdown the :class:`Executor` (waiting as if :meth:`Executor.shutdown`
were called with *wait* set to ``True``)::
import shutil
with ThreadPoolExecutor(max_workers=4) as e: