[gtk+] GtkMenuItem: Add since 3.2 tags for 2 signals.

[Murray Cumming <murrayc src gnome org>]

commit c6e1024a86a1556ffed6e4c6c5382f2ef70667d4
Author: Murray Cumming <murrayc murrayc com>
Date:   Mon Mar 26 10:50:55 2012 +0200

    GtkMenuItem: Add since 3.2 tags for 2 signals.
    
    These signals were added in this commit in 2010-09:
    http://git.gnome.org/browse/gtk+/commit/gtk/gtkmenuitem.c?id=3bd93e5bfd968d21cbcba15b952b254c41f204f9

 gtk/gtkmenuitem.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkmenuitem.c b/gtk/gtkmenuitem.c
index 5a7b166..236923d 100644
--- a/gtk/gtkmenuitem.c
+++ b/gtk/gtkmenuitem.c
@@ -296,6 +296,9 @@ gtk_menu_item_class_init (GtkMenuItemClass *klass)
                   G_TYPE_NONE, 1,
                   G_TYPE_INT);
 
+  /**
+   * Since: 3.2
+   */
   menu_item_signals[SELECT] =
     g_signal_new (I_("select"),
                   G_OBJECT_CLASS_TYPE (gobject_class),
@@ -305,6 +308,9 @@ gtk_menu_item_class_init (GtkMenuItemClass *klass)
                   _gtk_marshal_VOID__VOID,
                   G_TYPE_NONE, 0);
 
+  /**
+   * Since: 3.2
+   */
   menu_item_signals[DESELECT] =
     g_signal_new (I_("deselect"),
                   G_OBJECT_CLASS_TYPE (gobject_class),