fix(typings): update test.typings for abstract superclasses

modules/angular2/src/core/render/api.ts

@@ -152,6 +152,8 @@ export interface RenderElementRef {
   renderView: RenderViewRef;
 
   /**
+   * @internal
+   *
    * Index of the Element (in the depth-first order) inside the Render View.
    *
    * This index is used internally by Angular to locate elements.