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

[Dubslow]

Dubslow <bunslow at gmail.com> added the comment:

Perhaps the loop variable could be renamed to "len_minus_1" or some such something which is more semantic to the algorithm.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32099>
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