[issue38413] Remove or change "Multithreading" section

[David Kernan]

Change by David Kernan <davidsmurf at gmail.com>:


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keywords: +patch
pull_requests: +16262
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/16678

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38413>
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