[gtk+] GtkActionable: Update the docs

[Matthias Clasen <matthiasc src gnome org>]

commit 1af5f6d5071693ed6db956cc7e1863c624f50326
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri May 30 07:05:50 2014 -0400

    GtkActionable: Update the docs
    
    Actionable is no longer restricted to "app" and "win" actions.

 gtk/gtkactionable.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)
---
diff --git a/gtk/gtkactionable.c b/gtk/gtkactionable.c
index e6b7cf9..11c435a 100644
--- a/gtk/gtkactionable.c
+++ b/gtk/gtkactionable.c
@@ -37,10 +37,11 @@
  * and #GtkActionable:action-target. There are also some convenience APIs
  * for setting these properties.
  *
- * This interface is presently only meaningful if used on a widget that
- * is (or will be) located inside of a #GtkApplicationWindow and can
- * only be used to associate the widget with actions on that window, or
- * its associated #GtkApplication.
+ * The action will be looked up in action groups that are found among
+ * the widgets ancestors. Most commonly, these will be the actions with
+ * the "win" or "app" prefix that are associated with the #GtkApplicationWindow
+ * or "GtkApplication, but other action groups that are added with
+ * gtk_widget_insert_action_group() will be consulted as well.
  *
  * Since: 3.4
  **/