refactor: move angular source to /packages rather than modules/@angular

packages/examples/forms/ts/radioButtons/radio_button_example.ts

@@ -0,0 +1,28 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+// #docregion TemplateDriven
+import {Component} from '@angular/core';
+
+@Component({
+  selector: 'example-app',
+  template: `
+    <form #f="ngForm">
+      <input type="radio" value="beef" name="food" [(ngModel)]="myFood"> Beef
+      <input type="radio" value="lamb" name="food" [(ngModel)]="myFood"> Lamb
+      <input type="radio" value="fish" name="food" [(ngModel)]="myFood"> Fish
+    </form>
+    
+    <p>Form value: {{ f.value | json }}</p>  <!-- {food: 'lamb' } -->
+    <p>myFood value: {{ myFood }}</p>  <!-- 'lamb' -->
+  `,
+})
+export class RadioButtonComp {
+  myFood = 'lamb';
+}
+// #enddocregion