message: docs: fix header mistake
  The code example refers to `src/app/heroes/heroes.component.html` but its header was `src/app/hero.service.ts` which was obviously a mistake.
  PR Close
diff: @@ -317,7 +317,7 @@ Each hero in the heroes list should have a delete button.
  Add the following button element to the `HeroesComponent` template, after the hero
  name in the repeated `<li>` element.
  -<code-example path="toh-pt6/src/app/heroes/heroes.component.html" header="src/app/hero.service.ts" region="delete"></code-example>
  +<code-example path="toh-pt6/src/app/heroes/heroes.component.html" header="src/app/heroes/heroes.component.html" region="delete"></code-example>
  The HTML for the list of heroes should look like this:
  