[docs] [issue21314] Document '/' in signatures

[Pradyun Gedam]

Pradyun Gedam <pradyunsg at gmail.com> added the comment:

We now have a PEP for this; just noting this here since I don't see a cross reference between them.

https://www.python.org/dev/peps/pep-0570/

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nosy: +pradyunsg

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