[issue46291] [doc] First argument to raise can also be BaseException

[Irit Katriel]

Change by Irit Katriel <iritkatriel at gmail.com>:


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versions:  -Python 3.6, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46291>
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