message: docs: add note on importing AppRoutingModule
  Fixes
  PR Close
diff: @@ -106,7 +106,7 @@ The `<router-outlet>` tells the router where to display routed views.
  <div class="alert is-helpful">
  The `RouterOutlet` is one of the router directives that became available to the `AppComponent`
  -because `AppModule` imports `AppRoutingModule` which exported `RouterModule`.
  +because `AppModule` imports `AppRoutingModule` which exported `RouterModule`. The `ng generate` command you ran at the start of this tutorial added this import because of the `--module=app` flag. If you manually created `app-routing.module.ts` or used a tool other than the CLI to do so, you'll need to import `AppRoutingModule` into `app.module.ts` and add it to the `imports` array of the `NgModule`.
  </div>
  