[docs] [issue18301] In itertools.chain.from_iterable() there is no cls argument

[R. David Murray]

R. David Murray added the comment:

It is implemented as a classmethod, but the "equivalent" code doesn't need to be part of the class all.  I'm not sure what should be done here (say @staticmethod?  Leave the decorator off?).  We should probably see what Raymond thinks.  I lean toward the latter, that's the way it is in the python2 docs, and it doesn't seem to have caused any confusion.

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nosy: +r.david.murray, rhettinger

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