[docs] [issue12003] documentation: alternate version of xrange seems to fail.

[Eli Bendersky]

Eli Bendersky <eliben at gmail.com> added the comment:

Éric, I'm not sure that the note is necessary at all, but once it's there, it should value *correctness* over conciseness and readability.

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<http://bugs.python.org/issue12003>
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