Minor reword

Author: javiereguiluz

testing/http_authentication.rst

@@ -30,14 +30,16 @@ firewall, but only in the configuration file used by tests:
         # app/config/config_test.yml
         security:
             firewalls:
-                your_firewall_name:
+                # replace 'main' by the name of your own firewall
+                main:
                     http_basic: ~
 
     .. code-block:: xml
 
         <!-- app/config/config_test.xml -->
         <security:config>
-            <security:firewall name="your_firewall_name">
+            <!-- replace 'main' by the name of your own firewall -->
+            <security:firewall name="main">
               <security:http-basic />
            </security:firewall>
         </security:config>
@@ -47,18 +49,13 @@ firewall, but only in the configuration file used by tests:
         // app/config/config_test.php
         $container->loadFromExtension('security', array(
             'firewalls' => array(
-                'your_firewall_name' => array(
+                // replace 'main' by the name of your own firewall
+                'main' => array(
                     'http_basic' => array(),
                 ),
             ),
         ));
 
-.. caution::
-
-     It's crucial to use the same firewall name which is used in ``security.yml`` (e.g. ``main``
-     instead of ``your_firewall_name``). So you won't define a *new* element (a new firewall)
-     under ``security.firewalls``, but alter the original firewall configuration.
-
 Tests can now authenticate via HTTP passing the username and password as server
 variables using the second argument of ``createClient()``::