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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

May be mention that the result of PyUnicode_AsUTF8() can contain null bytes? And the same for PyBytes_AS_STRING()/PyBytes_AsString()?

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nosy: +serhiy.storchaka

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