message: docs: Improve docs for downgrading a service
  PR Close
diff: @@ -778,16 +778,25 @@ delete them once the upgrade is over.
  It's also recommended to export the `heroesServiceFactory` function so that Ahead-of-Time
  compilation can pick it up.
  +<div class="alert is-helpful">
  +
  +**Note:** The 'heroes' string inside the factory refers to the AngularJS `HeroesService`.
  +It is common in AngularJS apps to choose a service name for the token, for example "heroes",
  +and append the "Service" suffix to create the class name.
  +
  +</div>
  +
  <code-example path="upgrade-module/src/app/ajs-to-a-providers/ajs-upgraded-providers.ts" title="ajs-upgraded-providers.ts">
  </code-example>
  +You can then provide the service to Angular by adding it to the `@NgModule`:
  +
  <code-example path="upgrade-module/src/app/ajs-to-a-providers/app.module.ts" region="register" title="app.module.ts">
  </code-example>
  -You can then inject it in Angular using its class as a type annotation:
  +Then use the service inside your component by injecting it in the component constructor using its class as a type annotation:
  <code-example path="upgrade-module/src/app/ajs-to-a-providers/hero-detail.component.ts" title="hero-detail.component.ts">
  -
  </code-example>
  <div class="alert is-helpful">
  