[gtk+] menuitem: Document some style properties as deprecated

[Matthias Clasen <matthiasc src gnome org>]

commit bab98a842700ef4bea7be862061ff57362dbee00
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Nov 16 06:15:48 2015 -0500

    menuitem: Document some style properties as deprecated
    
    No code change.

 gtk/gtkmenuitem.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkmenuitem.c b/gtk/gtkmenuitem.c
index 078a189..edd9964 100644
--- a/gtk/gtkmenuitem.c
+++ b/gtk/gtkmenuitem.c
@@ -486,6 +486,14 @@ gtk_menu_item_class_init (GtkMenuItemClass *klass)
   g_object_class_override_property (gobject_class, PROP_ACTION_NAME, "action-name");
   g_object_class_override_property (gobject_class, PROP_ACTION_TARGET, "action-target");
 
+  /**
+   * GtkMenuItem:selected-shadow-type:
+   *
+   * The shadow type when the item is selected.
+   *
+   * Deprecated: 3.20: Use CSS to determine the shadow; the value of this
+   *     style property is ignored.
+   */
   gtk_widget_class_install_style_property (widget_class,
                                            g_param_spec_enum ("selected-shadow-type",
                                                               "Selected Shadow Type",