Update toh-pt1.jade (#3495)

The 'hero' property is in the AppComponent class, not in Hero.

Author: Double-A-92

public/docs/ts/latest/tutorial/toh-pt1.jade

@@ -76,7 +76,7 @@ code-example(language="sh" class="code-shell").
 +makeExample('toh-1/ts/src/app/app.component.ts', 'hero-class-1', 'src/app/app.component.ts (Hero class)')(format=".")
 
 :marked
-  In the `Hero` class, refactor the component's `hero` property to be of type `Hero`,
+  In the `AppComponent` class, refactor the component's `hero` property to be of type `Hero`,
   then initialize it with an `id` of `1` and the name `Windstorm`.
 
 +makeExample('toh-1/ts/src/app/app.component.ts', 'hero-property-1', 'src/app/app.component.ts (hero property)')(format=".")