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

[Марк Коренберг]

Марк Коренберг <socketpair at gmail.com> added the comment:

ensure_ascii is documented only in Jsonencoder class. Other functions like dumps() should refer to this class description for that parameter.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13770>
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