[issue42179] Clarify chaining exceptions in tutorial/errors.rst

[Inada Naoki]

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

Please note that tutorial is a tutorial. It is document to help new user who are learning Python.
Do you believe special attributes like __cause__ and __contexts__ are really worth to teach for tutorial readers?

Generally speaking, I think we should *reduce* some details from tutorial.

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nosy: +methane

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<https://bugs.python.org/issue42179>
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