message: docs(aio): Fix typo in tutorial
  PR Close
diff: @@ -30,7 +30,7 @@ Using the Angular CLI, create a service called `hero`.
  ng generate service hero
  </code-example>
  -The command generates skeleton `HeroService` class in `src/app.hero.service.ts`
  +The command generates skeleton `HeroService` class in `src/app/hero.service.ts`
  The `HeroService` class should look like the below.
  <code-example path="toh-pt4/src/app/hero.service.1.ts" region="new"
  