message: docs: correct toh router tutorial
  * `SelectivePreloadingStrategyService` is already provided in the root
  module, so it should not be added to `AppRoutingModule` providers
  array
  PR Close
diff: @@ -2803,7 +2803,6 @@ But first, make a few changes to the `AppRoutingModule`.
  1. Import `SelectivePreloadingStrategyService` into `AppRoutingModule`.
  1. Replace the `PreloadAllModules` strategy in the call to `forRoot()` with this `SelectivePreloadingStrategyService`.
  -1. Add the `SelectivePreloadingStrategyService` strategy to the `AppRoutingModule` providers array so you can inject it elsewhere in the app.
  Now edit the `AdminDashboardComponent` to display the log of preloaded routes.
  