add: Reference::AnimationUtils doc mapping

docs/list.js

@@ -500,7 +500,8 @@ var list = {
 				"AnimationAction": "api/ar/animation/AnimationAction",
 				"AnimationClip": "api/ar/animation/AnimationClip",
 				"AnimationMixer": "api/ar/animation/AnimationMixer",
-				"AnimationObjectGroup": "api/ar/animation/AnimationObjectGroup"
+				"AnimationObjectGroup": "api/ar/animation/AnimationObjectGroup",
+				"AnimationUtils": "api/ar/animation/AnimationUtils"
 			}
 
 		}