[gtk+] progressbar: Add diagrams to CSS documentation

[Matthias Clasen <matthiasc src gnome org>]

commit 332ea5f8ec1b9ffd3adeb8f7fa5286898e2f29ff
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Nov 3 13:37:57 2015 -0500

    progressbar: Add diagrams to CSS documentation

 gtk/gtkprogressbar.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkprogressbar.c b/gtk/gtkprogressbar.c
index e8d4987..3339216 100644
--- a/gtk/gtkprogressbar.c
+++ b/gtk/gtkprogressbar.c
@@ -68,6 +68,11 @@
  *
  * # CSS nodes
  *
+ * |[<!-- language="plain" -->
+ * progressbar
+ * ╰── progress[.pulse]
+ * ]|
+ *
  * GtkProgressBar has a main CSS node with name progressbar and a subnode
  * with name progress. The subnode has the style class .pulse when in activity
  * mode. It gets the style classes .left, .right, .top or .bottom added when