[issue47022] PEP 594: Document removal of asynchat, asyncore and smtpd

[Alex Waygood]

Change by Alex Waygood <Alex.Waygood at Gmail.com>:


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assignee:  -> docs at python
components: +Documentation
nosy: +docs at python
stage: patch review -> backport needed
versions: +Python 3.10, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue47022>
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