[atk] doc: extend atk_focus_tracker_notify deprecation documentation

[Alejandro Piñeiro Iglesias <apinheiro src gnome org>]

commit 89e2790f3e94de24cbabd55f211800054dcc81a1
Author: Alejandro Piñeiro <apinheiro igalia com>
Date:   Mon Nov 17 14:52:04 2014 +0100

    doc: extend atk_focus_tracker_notify deprecation documentation

 atk/atkutil.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/atk/atkutil.c b/atk/atkutil.c
index bc4c0a6..f57e2fa 100755
--- a/atk/atkutil.c
+++ b/atk/atkutil.c
@@ -200,7 +200,10 @@ atk_remove_focus_tracker (guint            tracker_id)
  *
  * Deprecated: This method is deprecated since ATK version
  * 2.9.4. Focus tracking has been dropped as a feature to be
- * implemented by ATK itself.
+ * implemented by ATK itself. As #AtkObject::focus-event was
+ * deprecated in favor of a #AtkObject::state-change signal, in order
+ * to notify a focus change on your implementation, you can use
+ * atk_object_notify_state_change() instead.
  *
  **/
 void