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

[Martin Panter]

Martin Panter added the comment:

Posting a new patch that says that the NUL is always appended for both Unicode and Bytes, and explicitly says that internal NULs are allowed.

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Added file: http://bugs.python.org/file38420/utf8-null.v2.patch

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