make use of route property of LinkTo component (ember-learn#588)

Author: dennismende

guides/release/models/index.md

@@ -158,7 +158,7 @@ export default class DraftsButton extends Component {
 ```
 
 ```handlebars {data-filename=app/templates/components/drafts-button.hbs}
-<LinkTo "drafts" @tagName="button">
+<LinkTo @route="drafts" @tagName="button">
   Drafts ({{this.drafts.length}})
 </LinkTo>
 ```