[#3446] Minor tweaks as suggested by @xabbuh

Author: weaverryan

cookbook/configuration/apache_router.rst

@@ -7,11 +7,12 @@ How to use the Apache Router
 Symfony2, while fast out of the box, also provides various ways to increase that speed with a little bit of tweaking.
 One of these ways is by letting Apache handle routes directly, rather than using Symfony2 for this task.
 
-.. note::
+.. caution::
 
-    Apache router was deprecated in Symfony 2.5 and will be removed in Symfony 3.0.
-    Since the PHP implementation of the Router was improved, performance gains were no longer
-    significant (while it's very hard to replicate the same behaviour).
+    Apache router was deprecated in Symfony 2.5 and will be removed in Symfony
+    3.0. Since the PHP implementation of the Router was improved, performance
+    gains were no longer significant (while it's very hard to replicate the
+    same behavior).
 
 Change Router Configuration Parameters
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