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

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


----------
pull_requests: +28585
pull_request: https://github.com/python/cpython/pull/30374

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