[docs] [issue23088] Document that PyUnicode_AsUTF8() returns a null-terminated string

[Antoine Pitrou]

Antoine Pitrou added the comment:

This looks good to me.

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nosy: +pitrou
stage:  -> commit review
type:  -> behavior
versions: +Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23088>
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