[clutter/clutter-1.18] docs: Explicitly mention that Transition is abstract

[Emmanuele Bassi <ebassi src gnome org>]

commit dd08b6fd9856a91c71881a61f109874c9e52a629
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Feb 10 18:32:36 2014 +0000

    docs: Explicitly mention that Transition is abstract
    
    https://bugzilla.gnome.org/show_bug.cgi?id=710232

 clutter/clutter-transition.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/clutter/clutter-transition.c b/clutter/clutter-transition.c
index 5897641..28f289e 100644
--- a/clutter/clutter-transition.c
+++ b/clutter/clutter-transition.c
@@ -26,8 +26,8 @@
  * @Title: ClutterTransition
  * @Short_Description: Transition between two values
  *
- * #ClutterTransition is a subclass of #ClutterTimeline that computes
- * the interpolation between two values, stored by a #ClutterInterval.
+ * #ClutterTransition is an abstract subclass of #ClutterTimeline that
+ * computes the interpolation between two values, stored by a #ClutterInterval.
  */
 
 #ifdef HAVE_CONFIG_H