[docs] [issue32099] Use range in itertools roundrobin recipe

[Tim Peters]

Tim Peters <tim at python.org> added the comment:

I agree the current recipe strikes a very nice balance among competing interests, and is educational on several counts.

s/pending/numactive/

    # Remove the iterator we just exhausted from the cycle.
    numactive -= 1
    nexts = cycle(islice(nexts, numactive))

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nosy: +tim.peters

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<https://bugs.python.org/issue32099>
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