[doc] Clarify exception in multiprocessing.cpu_count (GH-23660)

Previous wording didn't explain the slightly unintuitive behavior.

Co-authored-by: kj <28750310+Fidget-Spinner@users.noreply.github.com>
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Emmanuel Arias 2021-09-17 19:58:20 -03:00 committed by GitHub
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@ -951,7 +951,8 @@ Miscellaneous
use. The number of usable CPUs can be obtained with
``len(os.sched_getaffinity(0))``
May raise :exc:`NotImplementedError`.
When the number of CPUs cannot be determined a :exc:`NotImplementedError`
is raised.
.. seealso::
:func:`os.cpu_count`