Add docs.

Add docs.

	* gtk/gtkcontainer.c (gtk_container_class_install_child_property):
	(gtk_container_child_get_valist):
	(gtk_container_child_get_property):
	(gtk_container_child_set_valist):
	(gtk_container_child_set_property):
	(gtk_container_add_with_properties):
	(gtk_container_child_set):
	(gtk_container_child_get): Add docs.

	* gtk/gtkwindow.c (gtk_window_activate_default):
	(gtk_window_activate_focus): Add docs.