[issue19202] Additions to docs

[Georg Brandl]

Georg Brandl added the comment:

Most of these changes should not be applied: the "alternate" equivalents in terms of reduce() will not help understanding,  Equivalents for reduce() may be useful, but I would limit them to one per case, possibly even just one function that covers both cases.

I'm deferring to Raymond for the changes to the itertools docs.

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nosy: +georg.brandl, rhettinger

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