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

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

I think the advice should stay as-is.  In my experience as a teacher, the possibility doesn't usually occur to people without it having been suggested.  Also, it mirrors practices in the standard library (decimal.DecimalException and sqlite3.DatabaseError).  For users, it provides a way to catch possible errors that are specific to a particular module.

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nosy: +rhettinger

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<https://bugs.python.org/issue34538>
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