added missing @throws

lib/Twig/TokenParserInterface.php

@@ -29,6 +29,8 @@ interface Twig_TokenParserInterface
      * @param Twig_Token $token A Twig_Token instance
      *
      * @return Twig_NodeInterface A Twig_NodeInterface instance
+     *
+     * @throws Twig_Error_Syntax
      */
     public function parse(Twig_Token $token);