Update Traverse.rst

Added missing ";"

Author: NicolasJourdan

reference/constraints/Traverse.rst

@@ -25,7 +25,7 @@ that all have constraints on their properties.
         namespace App\Entity;
 
         use Doctrine\Common\Collections\ArrayCollection;
-        use Doctrine\Common\Collections\Collection
+        use Doctrine\Common\Collections\Collection;
         use Doctrine\ORM\Mapping as ORM;
         use Symfony\Component\Validator\Constraints as Assert;