Fixed code examples in cookbook/logging

Author: wouterj

cookbook/logging/monolog_email.rst

@@ -33,6 +33,7 @@ it is broken down.
 
     .. code-block:: xml
 
+        <!-- app/config/config.xml -->
         <container xmlns="http://symfony.com/schema/dic/services"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:monolog="http://symfony.com/schema/dic/monolog"
@@ -112,6 +113,7 @@ get logged on the server as well as the emails being sent:
 
     .. code-block:: xml
 
+        <!-- app/config/config.xml -->
         <container xmlns="http://symfony.com/schema/dic/services"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:monolog="http://symfony.com/schema/dic/monolog"
@@ -156,4 +158,4 @@ This uses the ``group`` handler to send the messages to the two
 group members, the ``buffered`` and the ``stream`` handlers. The messages will
 now be both written to the log file and emailed.
 
-.. _Monolog: https://github.com/Seldaek/monolog
+.. _Monolog: https://github.com/Seldaek/monolog