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Sync whatsnew with the edit I made in the 3.12 backport PR. (#109807) 

A post main merge edit to the text was added in the 3.12 backport PR.
  e38d7104b8

This includes that in main.  It's a minor edit over #109767 to resolve the comment there.
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Gregory P. Smith 2023-09-24 10:27:24 -07:00 committed by GitHub
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@ -1071,7 +1071,9 @@ Deprecated
with the POSIX platform when doing so. Even if such code *appeared* to work.
We added the warning to to raise awareness as issues encounted by code doing
this are becoming more frequent. See the :func:`os.fork` documentation for
more details.
more details along with `this discussion on fork being incompatible with threads
<https://discuss.python.org/t/33555>`_ for *why* we're now surfacing this
longstanding platform compatibility problem to developers.
When this warning appears due to usage of :mod:`multiprocessing` or
:mod:`concurrent.futures` the fix is to use a different