[docs] [issue35105] Document that CPython accepts "invalid" identifiers

[orlnub123]

orlnub123 <orlnub123 at gmail.com> added the comment:

I'd argue that it's an implementation detail. Documenting it might be nice as some projects such as pytest do use it but I don't think it would make sense in setattr() or getattr() since all they do (at least in this case) is assign/retrieve from the __dict__. One thing to note is that __slots__ doesn't accept them.

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nosy: +orlnub123

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