Fix typos

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.3
| Fixed tickets |

Author: ifdattic

components/serializer.rst

@@ -139,7 +139,7 @@ of the ``Person`` class would be encoded in XML format::
     </person>
     EOF;
 
-    $person = $serializer->deserialize($data,'Acme\Person','xml');
+    $person = $serializer->deserialize($data, 'Acme\Person', 'xml');
 
 In this case, :method:`Symfony\\Component\\Serializer\\Serializer::deserialize`
 needs three parameters: