[docs] [issue12943] tokenize: add python -m tokenize support back

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

I made a few last remarks on Rietveld; feel free to address or ignore them and commit right away.

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nosy: +eric.araujo

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12943>
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