docs: Add missing deprecation annotations

https://bugzilla.gnome.org/show_bug.cgi?id=709252

clutter/deprecated/clutter-alpha.h

@@ -58,6 +58,8 @@ typedef struct _ClutterAlphaPrivate     ClutterAlphaPrivate;
  * Return value: a floating point value
  *
  * Since: 0.2
+ *
+ * Deprecated: 1.12: Use #ClutterTimelineProgressFunc instead.
  */
 typedef gdouble (*ClutterAlphaFunc) (ClutterAlpha *alpha,
                                      gpointer      user_data); 
@@ -70,6 +72,8 @@ typedef gdouble (*ClutterAlphaFunc) (ClutterAlpha *alpha,
  * only be accessed using the provided API.
  *
  * Since: 0.2
+ *
+ * Deprecated: 1.12: Use #ClutterTimeline instead
  */
 struct _ClutterAlpha
 {
@@ -85,6 +89,8 @@ struct _ClutterAlpha
  * Base class for #ClutterAlpha
  *
  * Since: 0.2
+ *
+ * Deprecated: 1.12: Use #ClutterTimeline instead
  */
 struct _ClutterAlphaClass
 {

clutter/deprecated/clutter-animation.h

@@ -50,6 +50,8 @@ typedef struct _ClutterAnimationClass           ClutterAnimationClass;
  * be accessed using the provided functions.
  *
  * Since: 1.0
+ *
+ * Deprecated: 1.12: Use the implicit animation on #ClutterActor
  */
 struct _ClutterAnimation
 {
@@ -68,6 +70,8 @@ struct _ClutterAnimation
  * should be accessed using the provided functions.
  *
  * Since: 1.0
+ *
+ * Deprecated: 1.12: Use the implicit animation on #ClutterActor
  */
 struct _ClutterAnimationClass
 {

clutter/deprecated/clutter-animator.h

@@ -54,6 +54,8 @@ typedef struct _ClutterAnimatorPrivate ClutterAnimatorPrivate;
  * A key frame inside a #ClutterAnimator
  *
  * Since: 1.2
+ *
+ * Deprecated: 1.12
  */
 typedef struct _ClutterAnimatorKey     ClutterAnimatorKey;