Fixed typo in the documentation

docs/en/reference/working-with-objects.rst

@@ -821,9 +821,10 @@ in a central location.
     namespace MyDomain\Model;
     
     use Doctrine\ORM\EntityRepository;
+    use Doctrine\ORM\Mapping as ORM;
     
     /**
-     * @entity(repositoryClass="MyDomain\Model\UserRepository")
+     * @ORM\Entity(repositoryClass="MyDomain\Model\UserRepository")
      */
     class User
     {