style(docs-infra): fix docs examples for tslint rules related to whitespace (#38143)

This commit updates the docs examples to be compatible with the `align`,
`space-before-function-paren` and `typedef-whitespace` tslint rules.

This is in preparation of updating the docs examples `tslint.json` to
match the one generated for new Angular CLI apps in a future commit.

PR Close #38143

aio/content/examples/router/src/app/app-routing.module.9.ts

@@ -4,18 +4,21 @@ import { Routes, RouterModule } from '@angular/router'; // CLI imports router
 
 // #docregion child-routes
 const routes: Routes = [
-  { path: 'first-component',
+  {
+    path: 'first-component',
     component: FirstComponent, // this is the component with the <router-outlet> in the template
     children: [
       {
         path: 'child-a', // child route path
-        component: ChildAComponent // child route component that the router renders
+        component: ChildAComponent, // child route component that the router renders
       },
       {
         path: 'child-b',
-        component: ChildBComponent // another child route component that the router renders
-      }
-    ] },
+        component: ChildBComponent, // another child route component that the router renders
+      },
+    ],
+  },
+];
 // #enddocregion child-routes