[docs] Wrong method signature for Py_AddPendingCall

On the page http://docs.python.org/py3k/c-api/init.html#asynchronous-notifications, the method signature for Py_AddPendingCall is incorrect. It reads void Py_AddPendingCall(int (*func)(void *, void *arg)) when it should correctly read int Py_AddPendingCall(int (*func)(void *), void *arg) (the return type and the arguments are incorrectly listed). Robert