Add the @return types

src/Authjwt.php

@@ -106,7 +106,7 @@ class Authjwt extends Auth
   /** Save the auth data in cache directory and return the JWT token
     * Do not allow to store data if the $auth is anonymous
     * @param array $auth The authentication to save
-    * @return JWT token string
+    * @return string JWT token
     */
   public function createJwtToken ($auth)
   // {{{