[gtk+] docs: add docs for GtkWidgetAuxInfo

[William Jon McCann <mccann src gnome org>]

commit a2ba1789e10c1585f9a59f294c418987d53d6bae
Author: William Jon McCann <william jon mccann gmail com>
Date:   Tue Jan 21 10:28:23 2014 -0500

    docs: add docs for GtkWidgetAuxInfo

 gtk/gtkwidget.h |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkwidget.h b/gtk/gtkwidget.h
index 72e0c3f..77ece36 100644
--- a/gtk/gtkwidget.h
+++ b/gtk/gtkwidget.h
@@ -600,6 +600,15 @@ struct _GtkWidgetClass
   void (*_gtk_reserved7) (void);
 };
 
+/**
+ * GtkWidgetAuxInfo:
+ * @width: the widget's width
+ * @height: the widget's height
+ * @halign: the widget's horizontal alignment
+ * @valign: the widget's horizontal alignment
+ * @margin: the widget's #GtkBorder margins
+ *
+ */
 struct _GtkWidgetAuxInfo
 {
   gint width;