[issue41576] document BaseException in favour of bare except in error tutorial

[Serhiy Storchaka]

New submission from Serhiy Storchaka <storchaka+cpython at gmail.com>:

What a problem do you try to solve? What is wrong with the current documentation?

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nosy: +serhiy.storchaka

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41576>
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