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

INADA Naoki songofacandy@gmail.com added the comment:

I didn't claim this pattern is not used anymore. My point is "should we suggest this pattern for tutorial readers?"

* Is this pattern recommended blindly? -- I think no. * How / when this pattern is recommended? -- When there is use case people want to catch the base exception. * Should it be in tutorial? -- I doubt it. This topic requires some experience to understand.

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