[atk] atkcomponent: document that ->contains already have a default implementation

[Alejandro Piñeiro Iglesias <apinheiro src gnome org>]

commit 85ac8cb1ef96ee25619cee70dc0ee5594f1d8a1d
Author: Alejandro Piñeiro <apinheiro igalia com>
Date:   Fri Feb 7 13:54:34 2014 +0100

    atkcomponent: document that ->contains already have a default implementation

 atk/atkcomponent.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/atk/atkcomponent.c b/atk/atkcomponent.c
index d54ac97..2e5a19d 100755
--- a/atk/atkcomponent.c
+++ b/atk/atkcomponent.c
@@ -192,6 +192,10 @@ atk_component_remove_focus_handler (AtkComponent    *component,
  *
  * Checks whether the specified point is within the extent of the @component.
  *
+ * Toolkit implementor note: ATK provides a default implementation for
+ * this virtual method. In general there are little reason to
+ * re-implement it.
+ *
  * Returns: %TRUE or %FALSE indicating whether the specified point is within
  * the extent of the @component or not
  **/