small code style fix

framework/web/Request.php

@@ -146,13 +146,16 @@ class Request extends \yii\base\Request
 	 */
 	public $parsers = [];
 
+	/**
+	 * @var CookieCollection Collection of request cookies.
+	 */
 	private $_cookies;
-
 	/**
 	 * @var array the headers in this collection (indexed by the header names)
 	 */
 	private $_headers;
 
+
 	/**
 	 * Resolves the current request into a route and the associated parameters.
 	 * @return array the first element is the route, and the second is the associated parameters.