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

Raymond Hettinger raymond.hettinger@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.

---------- nosy: +rhettinger

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