Sone doc fixes.

Author: dunglas

components/serializer.rst

@@ -163,27 +163,23 @@ The definition of serialization can be specified using annotations, XML
 and YAML. The :class:Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory
 that will be used by the normalizer must be aware of the format to use.
 
-If you want to use annotations to define groups, initialize the :class:Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory
+Initialize the :class:Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory
 like the following::
 
-    use Symfony\Component\Serializer\Mapping\Loader\AnnotationLoader;
     use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory;
+    // For annotations
+    usr Doctrine\Common\Annotations\AnnotationReader;
+    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()));
-
-If you prefer XML::
-
-    use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory;
-    use Symfony\Component\Serializer\Mapping\Loader\XmlFileLoader;
-
-    $classMetadataFactory = new ClassMetadataFactory(new XmlFileLoader('/path/to/your/definition.xml'));
-
-And for YAML::
-
-    use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory;
-    use Symfony\Component\Serializer\Mapping\Loader\YamlFileLoader;
-
-    $classMetadataFactory = new ClassMetadataFactory(new YamlFileLoader('/path/to/your/definition.yml'));
+    // For XML
+    // $classMetadataFactory = new ClassMetadataFactory(new XmlFileLoader('/path/to/your/definition.xml'));
+    // For YAML
+    // $classMetadataFactory = new ClassMetadataFactory(new YamlFileLoader('/path/to/your/definition.yml'));
 
 Then, create your groups definition:
 
@@ -258,11 +254,11 @@ Ignoring Attributes
 -------------------
 
 .. versionadded:: 2.3
-    The :method:`GetSetMethodNormalizer::setIgnoredAttributes<Symfony\\Component\\Serializer\\Normalizer\\GetSetMethodNormalizer::setIgnoredAttributes>`
+    The :method:`Symfony\\Component\\Serializer\\Normalizer\\GetSetMethodNormalizer::setIgnoredAttributes`
     method was introduced in Symfony 2.3.
 
 .. versionadded:: 2.7
-    Before Symfony 2.7, attributes was only ignored while serializing. Since Symfony
+    Prior to Symfony 2.7, attributes were only ignored while serializing. Since Symfony
     2.7, they are ignored when deserializing too.
 
 As an option, there's a way to ignore attributes from the origin object. To remove