fix from review

Author: Simperfit

core/security.md

@@ -6,20 +6,18 @@ section.
 Using API Platform, you can leverage all security features provided by the [Symfony Security component](http://symfony.com/doc/current/book/security.html).
 For instance, if you wish to restrict the access of some endpoints, you can use [access controls directives](http://symfony.com/doc/current/book/security.html#securing-url-patterns-access-control).
 
-You can also add security directly in the entity using the [Symfony's access control expressions](https://symfony.com/doc/current/expressions.html#security-complex-access-controls-with-expressions).
-Here is a little exemple for this :
+Since 2.1, you can add security through [Symfony's access control expressions](https://symfony.com/doc/current/expressions.html#security-complex-access-controls-with-expressions) in your entities.
 
-```php
+Here is an example:
 
+```php
 use ApiPlatform\Core\Annotation\ApiResource;
 use Doctrine\ORM\Mapping as ORM;
 use Symfony\Component\Validator\Constraints as Assert;
 
 /**
  * Secured resource.
  *
- * @author Kévin Dunglas <dunglas@gmail.com>
- *
  * @ApiResource(
  *     attributes={"is_granted"="has_role('ROLE_USER')"},
  *     collectionOperations={
@@ -42,6 +40,7 @@ class Book
      * @ORM\GeneratedValue(strategy="AUTO")
      */
     public $id;
+    
     /**
      * @var string The title
      *