[issue35790] Correct the description of sys.exc_info() and add a code example

[Géry]

Change by Géry <gery.ogam at gmail.com>:


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nosy: +cheryl.sabella -eric.araujo, ezio.melotti, willingc
title: Correct a statement about sys.exc_info() values restoration -> Correct the description of sys.exc_info() and add a code example
type:  -> enhancement
versions: +Python 3.6, Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35790>
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