[docs] [issue31082] reduce takes iterable, not just sequence

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Yes, I think it can. But be aware that "sequence" is used not only in the signature, but in following description.

The term "sequence" in the documentation and the docstring looks to me like a synonym of "iterable", not a reference to collections.abc.Sequence. I don't know how the wording can be improved. Maybe looking at the documentation of builtins filter, map, zip, and itertools functions can help.

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nosy: +ncoghlan, rhettinger

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