docs(aio): rename cb- files and a few others

aio/content/examples/styleguide/src/07-03/app/app.component.ts

@@ -0,0 +1,13 @@
+// #docregion
+import { Component } from '@angular/core';
+
+import { HeroService } from './heroes';
+
+@Component({
+  selector: 'toh-app',
+  template: `
+      <toh-heroes></toh-heroes>
+    `,
+  providers: [HeroService]
+})
+export class AppComponent {}