Fixed actions() docs where alias was used to refer to class

docs/guide/controller.md

@@ -167,7 +167,7 @@ public SiteController extends \yii\web\Controller
 	{
 		return [
 			'about' => [
-				'class' => '@app/actions/Page',
+				'class' => 'app\actions\Page',
 				'view' => 'about',
 			],
 		];

framework/yii/base/Controller.php

@@ -87,9 +87,9 @@ class Controller extends Component implements ViewContextInterface
 	 *
 	 * ~~~
 	 * return [
-	 *     'action1' => '@app/components/Action1',
+	 *     'action1' => 'app\components\Action1',
 	 *     'action2' => [
-	 *         'class' => '@app/components/Action2',
+	 *         'class' => 'app\components\Action2',
 	 *         'property1' => 'value1',
 	 *         'property2' => 'value2',
 	 *     ],