[gtk+] docs: add missing method

[William Jon McCann <mccann src gnome org>]

commit 62b47774eaaff6aac49b95cd7ec4301d1b2efac8
Author: William Jon McCann <william jon mccann gmail com>
Date:   Mon Jan 20 19:54:48 2014 -0500

    docs: add missing method

 gtk/gtkcontainer.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkcontainer.h b/gtk/gtkcontainer.h
index 56db9f7..fdeed7b 100644
--- a/gtk/gtkcontainer.h
+++ b/gtk/gtkcontainer.h
@@ -66,6 +66,7 @@ struct _GtkContainer
  * @child_type: Returns the type of the children supported by the container.
  * @composite_name: Gets a widget's composite name. Deprecated: 3.10.
  * @set_child_property: Set a property on a child of container.
+ * @get_child_property: Get a property from a child of container.
  * @get_path_for_child: Get path representing entire widget hierarchy
  *    from the toplevel down to and including @child.
  *