docs: mark gtkdoc blocks as private for internal only API

gtk/gtkactionobserver.c

@@ -23,7 +23,7 @@
 
 G_DEFINE_INTERFACE (GtkActionObserver, gtk_action_observer, G_TYPE_OBJECT)
 
-/**
+/*< private >
  * SECTION:gtkactionobserver
  * @short_description: an interface implemented by objects that are
  *                     interested in monitoring actions for changes
@@ -54,7 +54,7 @@ gtk_action_observer_default_init (GtkActionObserverInterface *class)
 {
 }
 
-/**
+/*< private >
  * gtk_action_observer_action_added:
  * @observer: a #GtkActionObserver
  * @observable: the source of the event
@@ -85,7 +85,7 @@ gtk_action_observer_action_added (GtkActionObserver   *observer,
     ->action_added (observer, observable, action_name, parameter_type, enabled, state);
 }
 
-/**
+/*< private >
  * gtk_action_observer_action_enabled_changed:
  * @observer: a #GtkActionObserver
  * @observable: the source of the event
@@ -110,7 +110,7 @@ gtk_action_observer_action_enabled_changed (GtkActionObserver   *observer,
     ->action_enabled_changed (observer, observable, action_name, enabled);
 }
 
-/**
+/*< private >
  * gtk_action_observer_action_state_changed:
  * @observer: a #GtkActionObserver
  * @observable: the source of the event
@@ -135,7 +135,7 @@ gtk_action_observer_action_state_changed (GtkActionObserver   *observer,
     ->action_state_changed (observer, observable, action_name, state);
 }
 
-/**
+/*< private >
  * gtk_action_observer_action_removed:
  * @observer: a #GtkActionObserver
  * @observable: the source of the event
@@ -158,7 +158,7 @@ gtk_action_observer_action_removed (GtkActionObserver   *observer,
     ->action_removed (observer, observable, action_name);
 }
 
-/**
+/*< private >
  * gtk_action_observer_primary_accel_changed:
  * @observer: a #GtkActionObserver
  * @observable: the source of the event