[docs] [issue10001] ~Py_buffer.obj field is undocumented, though not hidden

[Lenard Lindstrom]

Lenard Lindstrom <len-l at telus.net> added the comment:

This will work for bf_getbuffer, though having PyObject_GetBuffer set 
the obj field before passing it to the callback might be safer. Also, 
this does not address the case with wrapper types like memoryview. What 
happens if ~Py_buffer.obj is not visited in tp_traverse? Should this be 
documented?

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