Doco(gridMenu): fix #2474 removeFromGridMenu documented twice

Author: PaulL1

src/js/core/directives/ui-grid-menu-button.js

@@ -78,7 +78,7 @@ angular.module('ui.grid')
     /**
      * @ngdoc function
      * @name addToGridMenu
-     * @propertyOf ui.grid.class:GridOptions
+     * @propertyOf ui.grid.gridMenuService
      * @description add items to the grid menu.  Used by features
      * to add their menu items if they are enabled, can also be used by
      * end users to add menu items.  This method has the advantage of allowing
@@ -108,7 +108,7 @@ angular.module('ui.grid')
     /**
      * @ngdoc function
      * @name removeFromGridMenu
-     * @methodOf ui.grid.core.api:PublicApi
+     * @methodOf ui.grid.gridMenuService
      * @description Remove an item from the grid menu based on a provided id.  Assumes
      * that the id is unique, removes only the last instance of that id.  Does nothing if
      * the specified id is not found.  If there is no gridMenuScope or registeredMenuItems