[docs] [issue23589] Redundant sentence in FAQ

[Demian Brecht]

Demian Brecht added the comment:

Not to throw a wrench into this, but would it perhaps not be worthwhile to refactor this section in order to include nonlocals as well (obviously not for 2.7)? It seems a little odd to me to have this amount of detail without mentioning nonlocal.

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nosy: +demian.brecht

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