message: docs: fix typo
  Replace wrong mention of 'heroService.delete()' with 'heroService.deleteHero()' because 'heroService.delete()' doesn't exist and 'heroService.deleteHero()' should be mentioned instead
  Resolves
  PR Close
diff: @@ -298,7 +298,7 @@ Add the `delete()` handler to the component class.
  Although the component delegates hero deletion to the `HeroService`, it remains responsible for updating its own list of heroes.
  The component's `delete()` method immediately removes the *hero-to-delete* from that list, anticipating that the `HeroService` will succeed on the server.
  -There's really nothing for the component to do with the `Observable` returned by `heroService.delete()` **but it must subscribe anyway**.
  +There's really nothing for the component to do with the `Observable` returned by `heroService.deleteHero()` **but it must subscribe anyway**.
  <div class="alert is-important">
  