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

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset 33d6da1b1c71 by Éric Araujo in branch '3.2':
Document json.dump ensure_ascii parameter (#13770)
http://hg.python.org/cpython/rev/33d6da1b1c71

New changeset 1cb9b8126534 by Éric Araujo in branch 'default':
Merge edits from 3.2 (#13716, #1040439, #2945, #13770, #6715)
http://hg.python.org/cpython/rev/1cb9b8126534

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nosy: +python-dev

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