fix docs typo on \yii/filters/Cors

framework/filters/Cors.php

@@ -39,6 +39,7 @@ use yii\web\Response;
  *     return [
  *         'corsFilter' => [
  *             'class' => \yii\filters\Cors::className(),
+ *             'cors' => [
  *                 // restrict access to
  *                 'Origin' => ['http://www.myserver.com', 'https://www.myserver.com'],
  *                 'Access-Control-Request-Method' => ['POST', 'PUT'],
@@ -48,6 +49,7 @@ use yii\web\Response;
  *                 'Access-Control-Allow-Credentials' => true,
  *                 // Allow OPTIONS caching
  *                 'Access-Control-Max-Age' => 3600,
+ *             ],
  *
  *         ],
  *     ];