Improving the docs about JMSSerializar and SF Serializer

Author: diegoholiveira

Resources/doc/1-setting_up_the_bundle.md

@@ -7,9 +7,10 @@ Step 1: Setting up the bundle
 
 > This bundle recommends using [JMSSerializer](https://github.com/schmittjoh/serializer) which is 
 > integrated into Symfony2 via [JMSSerializerBundle](https://github.com/schmittjoh/JMSSerializerBundle).
-> Please follow the instructions of the bundle to add it to your composer.json and how to set it up.
-> If you do not add a dependency to JMSSerializerBundle, you will need to manually setup an alternative
-> service and configure the Bundle to use it via the ``service`` section in the app config
+> If you want to use JMSSerializer, take a look into the instructions of the bundle to
+> install it and set it up. You can also use [Symfony Serializer](https://github.com/symfony/Serializer),
+> but if this case, you need to manually set it up and configure FOSRestBundle to use it
+> via the ``service`` section in the app config
 
 Simply run assuming you have installed composer.phar or composer binary:
 
@@ -31,8 +32,7 @@ public function registerBundles()
         // ...
         new FOS\RestBundle\FOSRestBundle(),
 
-        // if you installed FOSRestBundle using composer you shouldn't forget
-        // also registering JMSSerializerBundle.
+        // if you choose to use JMSSerializer, make sure that it is registered in your application
 
         // new JMS\SerializerBundle\JMSSerializerBundle(),
     );