[docs] [issue9014] Incorrect documentation of the PyObject_HEAD macro

A.M. Kuchling added the comment: The markup is not a huge deal, I think. I also did some bits of rewording that can probably be ignored. The TRACE_REFS question is the only important one, I think. ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue9014> _______________________________________