minor #10385 Minor typo fix on messenger xml config (ragboyjr)

This PR was submitted for the master branch but it was merged into the 4.1 branch instead (closes #10385).

Discussion
----------

Minor typo fix on messenger xml config

Commits
-------

18d917a Minor typo fix on messenger xml config

Author: javiereguiluz

messenger.rst

@@ -645,7 +645,7 @@ factories. Defining such requires a two-step configuration based on Symfony's
 
     .. code-block:: xml
 
-        <!-- cconfig/services.xml -->
+        <!-- config/services.xml -->
         <?xml version="1.0" encoding="UTF-8" ?>
         <container xmlns="http://symfony.com/schema/dic/services"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
@@ -845,7 +845,7 @@ Register your Factory
 
     .. code-block:: xml
 
-        <!-- cconfig/services.xml -->
+        <!-- config/services.xml -->
         <?xml version="1.0" encoding="UTF-8" ?>
         <container xmlns="http://symfony.com/schema/dic/services"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"