Add some element-type annotations to gtk apis

gtk/gtkbindings.c

@@ -801,7 +801,8 @@ gtk_binding_entry_remove (GtkBindingSet	 *binding_set,
  * @keyval:       key value
  * @modifiers:    key modifier
  * @signal_name:  signal name to be bound
- * @binding_args: list of #GtkBindingArg signal arguments
+ * @binding_args: (transfer none) (element-type GtkBindingArg):
+ *     list of #GtkBindingArg signal arguments
  *
  * Override or install a new key binding for @keyval with @modifiers on
  * @binding_set.

gtk/gtkcontainer.c

@@ -2359,9 +2359,10 @@ chain_widget_destroyed (GtkWidget *widget,
 }
 
 /**
- * gtk_container_set_focus_chain: 
+ * gtk_container_set_focus_chain:
  * @container: a #GtkContainer
- * @focusable_widgets: the new focus chain
+ * @focusable_widgets: (transfer none) (element-type GtkWidget):
+ *     the new focus chain
  *
  * Sets a focus chain, overriding the one computed automatically by GTK+.
  * 

gtk/gtkradiobutton.c

@@ -175,6 +175,17 @@ gtk_radio_button_get_property (GObject    *object,
     }
 }
 
+/**
+ * gtk_radio_button_set_group:
+ * @radio_button: a #GtkRadioButton.
+ * @group: (transfer none) (element-type GtkRadioButton): an existing radio
+ *     button group, such as one returned from gtk_radio_button_get_group().
+ *
+ * Sets a #GtkRadioButton's group. It should be noted that this does not change
+ * the layout of your interface in any way, so if you are changing the group,
+ * it is likely you will need to re-arrange the user interface to reflect these
+ * changes.
+ */
 void
 gtk_radio_button_set_group (GtkRadioButton *radio_button,
 			    GSList         *group)

gtk/gtkwidget.c

@@ -4532,16 +4532,18 @@ gtk_widget_remove_accelerator (GtkWidget      *widget,
 }
 
 /**
- * gtk_widget_list_accel_closures
+ * gtk_widget_list_accel_closures:
  * @widget:  widget to list accelerator closures for
- * @returns: a newly allocated #GList of closures
  *
  * Lists the closures used by @widget for accelerator group connections
  * with gtk_accel_group_connect_by_path() or gtk_accel_group_connect().
  * The closures can be used to monitor accelerator changes on @widget,
- * by connecting to the @GtkAccelGroup::accel-changed signal of the 
- * #GtkAccelGroup of a closure which can be found out with 
+ * by connecting to the @GtkAccelGroup::accel-changed signal of the
+ * #GtkAccelGroup of a closure which can be found out with
  * gtk_accel_group_from_accel_closure().
+ *
+ * Return value: (transfer container) (element-type GClosure):
+ *     a newly allocated #GList of closures
  */
 GList*
 gtk_widget_list_accel_closures (GtkWidget *widget)