cleanup link to symfony

Author: dbu

book/installation.rst

@@ -129,16 +129,17 @@ And then access the CMF via:
     http://localhost:8000
 
 
-Or if you run a default apache installation like described in the cookbook of symfony (http://symfony.com/doc/current/cookbook/configuration/web_server_configuration.html):
+If you run an Apache installation as described in the `Symfony cookbook article on setup`_,
+your URL will look like this:
 
 .. code-block:: text
 
     http://localhost/app_dev.php
-    
+
 .. note::
 
-    Adding the ``app_dev.php`` to the url in your browser is important to actually 
-    see the test page. Because the AcmeDemoBundle is only configured to work with the 
+    Adding the ``app_dev.php`` to the url in your browser is important to actually
+    see the test page. Because the AcmeDemoBundle is only configured to work with the
     Development Environment. (If you have a look at ``AppKernel.php`` you can easily
     spot why)
 
@@ -259,3 +260,4 @@ and then run the following command:
 .. _`guidelines in the symfony book`: http://symfony.com/doc/master/book/installation.html#configuration-and-setup
 .. _`the Symfony2 book`: http://symfony.com/doc/current/book/
 .. _`Fixtures`: http://symfony.com/doc/current/bundles/DoctrineFixturesBundle/index.html
+.. _`Symfony cookbook article on setup`: http://symfony.com/doc/current/cookbook/configuration/web_server_configuration.html