Fixed another wrgon XML config

Author: javiereguiluz

http_cache/esi.rst

@@ -71,7 +71,7 @@ First, to use ESI, be sure to enable it in your application configuration:
 
         <!-- config/packages/framework.xml -->
         <?xml version="1.0" encoding="UTF-8" ?>
-        <container xmlns="http://symfony.com/schema/dic/symfony"
+        <container xmlns="http://symfony.com/schema/dic/services"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:framework="http://symfony.com/schema/dic/symfony"
             xsi:schemaLocation="http://symfony.com/schema/dic/services