[issue34948] Document __warningregister__

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

And this case looks like playing with implementation details.

The official way to make the specified warning emitted more than once is to use warnings.filterwarnings():

>>> import warnings
>>> warnings.filterwarnings('always', "NOBODY expects the Spanish Inquisition!", UserWarning)
>>> warnings.warn("NOBODY expects the Spanish Inquisition!")
<stdin>:1: UserWarning: NOBODY expects the Spanish Inquisition!
>>> warnings.warn("NOBODY expects the Spanish Inquisition!")
<stdin>:1: UserWarning: NOBODY expects the Spanish Inquisition!

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