[docs] [issue9101] reference json format in file formats chapter

[anatoly techtonik]

anatoly techtonik <techtonik at gmail.com> added the comment:

Wow. That's much better - python makes progress. Does this `robot` stuff flies back to Roundup? Is it possible to specify "closes bug #9101" directly in commit message?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9101>
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