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

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

It is an implementation detail that some people need to know, and that is very unlikely to change.  In the pydev thread, Guido said
"
My feeling is that limiting it to strings is fine, but checking those
strings for resembling identifiers is pointless and wasteful."

We occasionally document such things in a 'CPython implementation detail' note.  I don't know the proper markup for these.  At present, I think the note should be in setattr and **kwargs docs.

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nosy: +terry.reedy

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