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

[Martin Panter]

Martin Panter added the comment:

Thanks for looking at this David. I am posting utf8-null.v5.patch, which tweaks some of the wording.

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Added file: http://bugs.python.org/file39357/utf8-null.v5.patch

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