[issue8939] Use C type names (PyUnicode etc;) in the C API docs

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Other changes of the patch:
 - "u#": remove "Non-Unicode objects are handled by interpreting their read-buffer pointer ...", it's no more true
 - "es", "es#": remove "... and objects convertible to Unicode into a character buffer", it's no more true
 - Py_BuildValue(), "K" and "L" formats: specify the name of the C type on Windows (_int64 / unsigned _int64) as done for PyArg_Parse*() long long types

If the patch is too long, I can try to split it into smaller parts.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8939>
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