Add full example to FormBuilder docs

modules/angular2/src/forms/form_builder.js

@@ -8,8 +8,51 @@ import * as modelModule from './model';
  *
  * # Example
  *
+ * ```
+ * import {Component, View, bootstrap} from 'angular2/angular2';
+ * import {FormBuilder, Validators, FormDirectives, ControlGroup} from 'angular2/forms';
+ * 
+ * @Component({
+ *   selector: 'login-comp',
+ *   injectables: [
+ *     FormBuilder
+ *   ]
+ * })
+ * @View({
+ *   template: `
+ *     <form [control-group]="loginForm">
+ *       Login <input control="login">
+ * 
+ *       <div control-group="passwordRetry">
+ *         Password <input type="password" control="password">
+ *         Confirm password <input type="password" control="passwordConfirmation">
+ *       </div>
+ *     </form>
+ *   `,
+ *   directives: [
+ *     FormDirectives
+ *   ]
+ * })
+ * class LoginComp {
+ *   loginForm: ControlGroup;
+ * 
+ *   constructor(builder: FormBuilder) {
+ *     this.loginForm = builder.group({
+ *       login: ["", Validators.required],
+ * 
+ *       passwordRetry: builder.group({
+ *         password: ["", Validators.required],
+ *         passwordConfirmation: ["", Validators.required]
+ *       })
+ *     });
+ *   }
+ * }
+ * 
+ * bootstrap(LoginComp)
+ * ```
+ * 
  * This example creates a {@link ControlGroup} that consists of a `login` {@link Control}, and a nested 
- * {@link ControlGroup} that defines a `password` and a `passwordConfirmation` {@link Control}.
+ * {@link ControlGroup} that defines a `password` and a `passwordConfirmation` {@link Control}:
  *
  * ```
  *  var loginForm = builder.group({