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

[Vladimir Ryabtsev]

Vladimir Ryabtsev <greatvovan at gmail.com> added the comment:

The issue won't be fixed, but other useful changes applied.

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resolution:  -> wont fix
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42179>
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