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

Antoine Pitrou <pitrou@free.fr> added the comment:

To avoid the strange-looking “a PyUnicodeObject object”, one can write “an instance of PyUnicodeObject”.

Or simply "a PyUnicodeObject". ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue8939> _______________________________________