fix(docs): rewrite description of MovingObject Update

Author: paagkame

osi_trafficupdate.proto

@@ -40,9 +40,9 @@ message TrafficUpdate
 
     // Updated moving object
     //
-    // \note Only the id, base member without dimension and base_polygon
-    // and the vehicle_classification.light_state members are considered in
-    // updates. All other members can be left undefined and will be
+    // \note Only the following member are considered in updates: id, base member 
+    // without dimension and base_polygon and the vehicle_classification.light_state.
+    // All other members can be left undefined and will be
     // ignored by the receiver of this message.
     //
     optional MovingObject update = 3;