docs(toh-6): missing create instruction (#2264)

fixes #2231
also addresses `<h1>` issue raised in PR #2256

Author: wardbell

public/docs/ts/latest/tutorial/toh-pt5.jade

@@ -665,6 +665,8 @@ block extract-id
 +makeExample('toh-4/ts/app/app.component.ts','template', 'app/heroes.component.ts (current template)')(format=".")
 
 :marked
+  Delete the `<h1>` at the top (forgot about it during the `AppComponent`-to-`HeroesComponent` conversion).
+  
   Delete the last line of the template with the `<my-hero-detail>` tags.
 
   We'll no longer show the full `HeroDetailComponent` here.

public/docs/ts/latest/tutorial/toh-pt6.jade

@@ -294,7 +294,11 @@ block get-heroes-details
   When the given name is non-blank, the handler delegates creation of the
   named hero to the hero service, and then adds the new hero to our !{_array}.
 
-  Go ahead, refresh the browser and create some new heroes!
+  Finally, we implement the `create` method in the `HeroService` class.
++makeExcerpt('app/hero.service.ts', 'create')
+
+:marked
+  Refresh the browser and create some new heroes!
 
 .l-main-section
 :marked