Remove templateName and renderTemplate documentation

.travis.yml

@@ -1,7 +1,7 @@
 ---
 language: node_js
 node_js:
-  - '12'
+  - '12.16.1'
 
 dist: trusty
 

guides/release/routing/rendering-a-template.md

@@ -18,17 +18,3 @@ Each template will be rendered into the `{{outlet}}` of its parent route's
 template. For example, the `posts.new` route will render its template into the
 `posts.hbs`'s `{{outlet}}`, and the `posts` route will render its template into
 the `application.hbs`'s `{{outlet}}`.
-
-If you want to render a template other than the default one, set the route's [`templateName`](https://api.emberjs.com/ember/release/classes/Route/properties/templateName?anchor=templateName) property to the name of
-the template you want to render instead.
-
-```javascript {data-filename=app/routes/posts.js}
-import Route from '@ember/routing/route';
-
-export default class PostsRoute extends Route {
-  templateName = 'posts/favorite-posts';
-}
-```
-
-You can override the [`renderTemplate()`](https://api.emberjs.com/ember/release/classes/Route/methods/renderTemplate?anchor=renderTemplate) hook if you want finer control over template rendering.
-Among other things, it allows you to choose the controller used to configure the template and specific outlet to render it into.