[docs] [issue20727] Improved roundrobin itertools recipe

[Gareth Rees]

Gareth Rees added the comment:

> benchmarks show it to be more than twice as fast

I'm sure they do, but other benchmarks show it to be more than twice as slow. Try something like:

    iterables = [range(100)] + [()] * 100

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nosy: +Gareth.Rees

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