Change parameter names to match the header file and the documentation.

Change parameter names to match the header file and the documentation.

	* gtk/gtkcontainer.c (gtk_container_class_install_child_property):
	(gtk_container_class_find_child_property):
	(gtk_container_class_list_child_properties):
	* gtk/gtkwidget.c (gtk_widget_class_find_style_property):
	(gtk_widget_class_list_style_properties): Change parameter names
	to match the header file and the documentation.