[issue23677] Mention dict and set comps in library reference

[R. David Murray]

R. David Murray added the comment:

Sounds reasonable.  Dict and set comprehensions were added later than list comprehensions, and we probably just didn't notice this needed updating.

Mark's patch, however, is incorrect.  Mark: the dict/set literal notation is a different thing from a comprehension.

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nosy: +r.david.murray

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