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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

There are other functions that returns null terminated data: PyByteArray_AsString(), PyBytes_AsStringAndSize(), PyUnicode_AS_UNICODE(), PyUnicode_AsUCS4Copy() PyUnicode_AsUnicode(), PyUnicode_AsUnicodeAndSize(), PyUnicode_AsWideCharString() and may be more. See also examples of notes about embedded null characters.

And for consistency with all other documentation this should be written as "null byte/character", not NUL.

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