[gtk+] GtkMenu: Document that gtk_widget_insert_action_group() can be used

[Xavier Claessens <xclaesse src gnome org>]

commit f979c3d7a23b67539e895bd6e3ee798c9c6ea1e5
Author: Xavier Claessens <xavier claessens collabora co uk>
Date:   Thu Oct 10 13:00:53 2013 -0400

    GtkMenu: Document that gtk_widget_insert_action_group() can be used

 gtk/gtkmenu.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkmenu.c b/gtk/gtkmenu.c
index 6a4f01e..f6b0c7a 100644
--- a/gtk/gtkmenu.c
+++ b/gtk/gtkmenu.c
@@ -5614,6 +5614,9 @@ gtk_menu_get_reserve_toggle_size (GtkMenu *menu)
  * by means of being attached to a widget (see gtk_menu_attach_to_widget())
  * that is contained within the #GtkApplicationWindows widget hierarchy.
  *
+ * Actions can also be added using gtk_widget_insert_action_group() on menu's
+ * attach widget or any if its parent widgets.
+ *
  * Returns: a new #GtkMenu
  *
  * Since: 3.4