docs($route): add param info for $routeUpdate event

Closes angular#11419

Author: fredsa

src/ngRoute/route.js

@@ -435,9 +435,11 @@ function $RouteProvider() {
      * @name $route#$routeUpdate
      * @eventType broadcast on root scope
      * @description
-     *
      * The `reloadOnSearch` property has been set to false, and we are reusing the same
      * instance of the Controller.
+     *
+     * @param {Object} angularEvent Synthetic event object
+     * @param {Route} current Current/previous route information.
      */
 
     var forceReload = false,