[gtk+/wip/ebassi/combo] docs: Add description for GtkOptionButton

[Emmanuele Bassi <ebassi src gnome org>]

commit 150c0cae9a2d004546b165904e88b2c187c852ed
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Aug 10 13:49:03 2015 +0100

    docs: Add description for GtkOptionButton

 gtk/gtkoptionbutton.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkoptionbutton.c b/gtk/gtkoptionbutton.c
index 2cd2056..b7507c8 100644
--- a/gtk/gtkoptionbutton.c
+++ b/gtk/gtkoptionbutton.c
@@ -28,6 +28,15 @@
 #include "gtkintl.h"
 #include "gtkprivate.h"
 
+/**
+ * SECTION:gtkoptionbutton
+ * @Short_description: A button widget tied to a GtkOptionList
+ * @Title: GtkOptionButton
+ * @See_also: #GtkOptionList
+ *
+ * GtkOptionButton is a button widget that can be used to show a
+ * #GtkOptionList as a pop over.
+ */
 
 enum {
   PROP_PLACEHOLDER_TEXT = 1