add: Animation::Tracks::StringKeyframeTrack doc mapping

docs/list.js

@@ -511,7 +511,8 @@ var list = {
 				"BooleanKeyframeTrack": "api/ar/animation/tracks/BooleanKeyframeTrack",
 				"ColorKeyframeTrack": "api/ar/animation/tracks/ColorKeyframeTrack",
 				"NumberKeyframeTrack": "api/ar/animation/tracks/NumberKeyframeTrack",
-				"QuaternionKeyframeTrack": "api/ar/animation/tracks/QuaternionKeyframeTrack"
+				"QuaternionKeyframeTrack": "api/ar/animation/tracks/QuaternionKeyframeTrack",
+				"StringKeyframeTrack": "api/ar/animation/tracks/StringKeyframeTrack"
 			}
 
 		}