[issue46081] Document the msg argument for assertRaises

[Ram Rachum]

Ram Rachum <ram at rachum.com> added the comment:

Thanks, but people looking at a specific function might not guess that the documentation for one of its arguments is hiding somewhere on the long page. This is especially relevant with a confusing argument like `msg`, since it's tempting to think that this would be the message of the expected exception.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46081>
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