[gtk+] notebook: Document CSS node order

[Matthias Clasen <matthiasc src gnome org>]

commit 2cf983eb307701254df34555c74ad6fd48144006
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Jan 22 23:14:09 2016 -0500

    notebook: Document CSS node order

 gtk/gtknotebook.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtknotebook.c b/gtk/gtknotebook.c
index e577464..ca665da 100644
--- a/gtk/gtknotebook.c
+++ b/gtk/gtknotebook.c
@@ -137,6 +137,8 @@
  * reorderable pages, the tab node gets the .reorderable-page class.
  *
  * A tab node gets the .dnd style class while it is moved with drag-and-drop.
+ *
+ * The nodes are always arranged from left-to-right, regarldess of text direction.
  */