[gtk+] paned: Add diagrams to CSS documentation

[Matthias Clasen <matthiasc src gnome org>]

commit c389511b8600d2b18f62a776829f596254bf8285
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Nov 3 14:21:30 2015 -0500

    paned: Add diagrams to CSS documentation

 gtk/gtkpaned.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkpaned.c b/gtk/gtkpaned.c
index d749d64..a959c6c 100644
--- a/gtk/gtkpaned.c
+++ b/gtk/gtkpaned.c
@@ -78,6 +78,11 @@
  *
  * # CSS nodes
  *
+ * |[<!-- language="plain" -->
+ * paned
+ * ╰── separator
+ * ]|
+ *
  * GtkPaned has a main CSS node with name paned, and a subnode for
  * the separator with name separator.
  *