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

[Éric Araujo]

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

Most probably.  The text model of Python has no bearing on the JSON spec, and 2.x as well as 3.x Pythons may want to output UTF-8 JSON or JavaScript-escaped ASCII-only JSON.  What specific wording is an issue?

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nosy: +eric.araujo
versions:  -Python 3.4

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