try to make the code examples less noisy

Author: OskarStark

components/serializer.rst

@@ -249,23 +249,30 @@ The definition of serialization can be specified using annotations, XML
 or YAML. The :class:`Symfony\\Component\\Serializer\\Mapping\\Factory\\ClassMetadataFactory`
 that will be used by the normalizer must be aware of the format to use.
 
-Initialize the :class:`Symfony\\Component\\Serializer\\Mapping\\Factory\\ClassMetadataFactory`
-like the following::
+The following code shows how to initialize the :class:`Symfony\\Component\\Serializer\\Mapping\\Factory\\ClassMetadataFactory`
+for each format:
+
+* Annotations in PHP files::
 
-    use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory;
-    // For annotations
     use Doctrine\Common\Annotations\AnnotationReader;
+    use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory;
     use Symfony\Component\Serializer\Mapping\Loader\AnnotationLoader;
-    // For XML
-    // use Symfony\Component\Serializer\Mapping\Loader\XmlFileLoader;
-    // For YAML
-    // use Symfony\Component\Serializer\Mapping\Loader\YamlFileLoader;
 
     $classMetadataFactory = new ClassMetadataFactory(new AnnotationLoader(new AnnotationReader()));
-    // For XML
-    // $classMetadataFactory = new ClassMetadataFactory(new XmlFileLoader('/path/to/your/definition.xml'));
-    // For YAML
-    // $classMetadataFactory = new ClassMetadataFactory(new YamlFileLoader('/path/to/your/definition.yml'));
+
+* XML files::
+
+    use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory;
+    use Symfony\Component\Serializer\Mapping\Loader\XmlFileLoader;
+
+    $classMetadataFactory = new ClassMetadataFactory(new XmlFileLoader('/path/to/your/definition.xml'));
+
+* YAML files::
+
+    use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory;
+    use Symfony\Component\Serializer\Mapping\Loader\YamlFileLoader;
+
+    $classMetadataFactory = new ClassMetadataFactory(new YamlFileLoader('/path/to/your/definition.yml'));
 
 .. _component-serializer-attributes-groups-annotations: