message: docs: update for hero service name change
  PR Close
diff: @@ -295,7 +295,7 @@ to every `HttpClient` save method.
  ### Making a POST request
  Apps often POST data to a server. They POST when submitting a form.
  -In the following example, the `HeroService` posts when adding a hero to the database.
  +In the following example, the `HeroesService` posts when adding a hero to the database.
  <code-example
  path="http/src/app/heroes/heroes.service.ts"
  @@ -350,7 +350,7 @@ The component isn't expecting a result from the delete operation, so it subscrib
  <div class="alert is-important">
  -You must call _subscribe()_ or nothing happens. Just calling `HeroService.deleteHero()` **does not initiate the DELETE request.**
  +You must call _subscribe()_ or nothing happens. Just calling `HeroesService.deleteHero()` **does not initiate the DELETE request.**
  </div>
  @@ -398,7 +398,7 @@ req.subscribe();
  ### Making a PUT request
  An app will send a PUT request to completely replace a resource with updated data.
  -The following `HeroService` example is just like the POST example.
  +The following `HeroesService` example is just like the POST example.
  <code-example
  path="http/src/app/heroes/heroes.service.ts"
  @@ -418,7 +418,7 @@ We have discussed the basic HTTP functionality in `@angular/common/http`, but so
  Other aspects of an outgoing request can be configured via the options object
  passed as the last argument to the `HttpClient` method.
  -You [saw earlier](#adding-headers) that the `HeroService` sets the default headers by
  +You [saw earlier](#adding-headers) that the `HeroesService` sets the default headers by
  passing an options object (`httpOptions`) to its save methods.
  You can do more.
  