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[3.12] gh-79149: document reentrant safety of loop.call_soon_threadsafe (GH-128662) (#128665)

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gh-79149: document reentrant safety of `loop.call_soon_threadsafe` (GH-128662)
(cherry picked from commit 4685401845)

Co-authored-by: Kumar Aditya <kumaraditya@python.org>
Co-authored-by: Thomas Grainger <tagrain@gmail.com>
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Doc/library/asyncio-eventloop.rst
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@ -236,6 +236,9 @@ Scheduling callbacks
another thread, this function *must* be used, since :meth:`call_soon` is not
thread-safe.
This function is safe to be called from a reentrant context or signal handler,
however, it is not safe or fruitful to use the returned handle in such contexts.
Raises :exc:`RuntimeError` if called on a loop that's been closed.
This can happen on a secondary thread when the main application is
shutting down.