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

[STINNER Victor]

STINNER Victor added the comment:

Serhiy Storchaka added the comment:
> And for consistency with all other documentation this should be written as "null byte/character", not NUL.

Agreed!

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<http://bugs.python.org/issue23088>
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