[docs] [issue13770] python3 & json: add ensure_ascii documentation

[Éric Araujo]

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

All right.  I’ll do like other parameters (see check_circular for an example) and just duplicate the two-line doc.

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assignee: docs at python -> eric.araujo
versions: +Python 2.7

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<http://bugs.python.org/issue13770>
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