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

[INADA Naoki]

INADA Naoki <songofacandy at gmail.com> added the comment:

I agree with you.

----------
nosy: +inada.naoki

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