Update testing.rst

By default there is no utill folder
symfony · xavierkaitha94 · Jan 21, 2019 · Jan 21, 2019 · ee7610173ac68dc19182373e84a9c99cfc04f9d9
commit ee7610173ac68dc19182373e84a9c99cfc04f9d9
diff --git a/testing.rst b/testing.rst
@@ -59,7 +59,7 @@ want to test the overall behavior of your application, see the section about

 Writing Symfony unit tests is no different from writing standard PHPUnit
 unit tests. Suppose, for example, that you have an *incredibly* simple class
-called ``Calculator`` in the ``Util/`` directory of the app bundle::
+called ``Calculator`` in the ``Util/`` directory (There is no utill directory, by default while installing symfony.You have to manually create it inside src folder)of the app bundle::

    // src/Util/Calculator.php
    namespace App\Util;