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

[Martin Panter]

Martin Panter added the comment:

utf8-null.v4.patch:

* Clarified some mentions of “string” and “character” as bytes or code points
* Copied the warning about embedded nulls to PyUnicode_AS_UNICODE()

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Added file: http://bugs.python.org/file38750/utf8-null.v4.patch

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