added includes for call_method.hpp and def.hpp

Author: CedricSchmeits

doc/reference/call_method.qbk

@@ -20,6 +20,8 @@ C++ Module Definition
 ``
 #include <boost/python/module.hpp>
 #include <boost/python/class.hpp>
+#include <boost/python/call_method.hpp>
+#include <boost/python/def.hpp>
 #include <boost/utility.hpp>
 #include <cstring>