[docs] [issue37934] Docs: Clarify NotImplemented use cases

[Vedran Čačić]

Vedran Čačić <vedgar at gmail.com> added the comment:

Well, it is the _intended_ use of NotImplemented. Of course you can use it whenever you want, just as you can use Ellipsis whenever you want. But I don't think docs should encourage that.

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nosy: +veky

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