change note to caution and simplify text

Author: joelclermont

book/service_container.rst

@@ -231,13 +231,13 @@ looks up the value of each parameter and uses it in the service definition.
 
         <argument type="string">http://symfony.com/?foo=%%s&bar=%%d</argument>
 
-.. note::
+.. caution::
 
-    It can be useful to pass other services in as arguments to your custom service.
-    For example, you may want to pass in the ``request`` service as an argument.
-    In these cases, you may receive a ``ScopeWideningInjectionException``.
-    To understand this problem better and learn how to solve it, refer to
-    the cookbook article :doc:`/cookbook/service_container/scopes`.
+    You may receive a 
+    :class:`Symfony\\Component\\DependencyInjection\\Exception\\ScopeWideningInjectionException`
+    when passing the ``request`` service as an argument. To understand this
+    problem better and learn how to solve it, refer to the cookbook article
+    :doc:`/cookbook/service_container/scopes`.
 
 The purpose of parameters is to feed information into services. Of course
 there was nothing wrong with defining the service without using any parameters.