[gtk+] Add missing docs

[Matthias Clasen <matthiasc src gnome org>]

commit 75dab1662cf7af7265f29fb99da952f8a8633d19
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Nov 30 19:22:51 2014 -0500

    Add missing docs
    
    Document GtkSwitch::state_set.

 gtk/gtkswitch.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkswitch.h b/gtk/gtkswitch.h
index 0e561f8..9ca42a0 100644
--- a/gtk/gtkswitch.h
+++ b/gtk/gtkswitch.h
@@ -63,6 +63,7 @@ struct _GtkSwitch
  * GtkSwitchClass:
  * @parent_class: The parent class.
  * @activate: An action signal and emitting it causes the switch to animate.
+ * @state_set: Class handler for the ::state-set signal.
  */
 struct _GtkSwitchClass
 {