[issue34538] Remove encouragement to author a base class for all Exception subclasses in a module

[Hugo van Kemenade]

Change by Hugo van Kemenade <hugovk+python at gmail.com>:


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keywords: +patch
nosy: +hugovk
nosy_count: 9.0 -> 10.0
pull_requests: +28575
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/30361

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34538>
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