message: docs: fix incorrect forms selector references
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diff: @@ -152,7 +152,8 @@ nothing to distinguish it from any component you've written before.
  Understanding this component requires only the Angular concepts covered in previous pages.
  * The code imports the Angular core library and the `Hero` model you just created.
  -* The `@Component` selector value of "hero-form" means you can drop this form in a parent template with a `<hero-form>` tag.
  +* The `@Component` selector value of "app-hero-form" means you can drop this form in a parent
  +template with a `<app-hero-form>` tag.
  * The `templateUrl` property points to a separate file for the template HTML.
  * You defined dummy data for `model` and `powers`, as befits a demo.
  