fix incompatible annotation with doctrine

[Doctrine\Common\Annotations\AnnotationException]
[Semantical Error] The annotation "@noinspection" in class Sonata\AdminBundle\Admin\AdminExtensionInterface was never imported. Did you maybe forget to add a "use" statement for this annotation?

Admin/AdminExtensionInterface.php

@@ -24,9 +24,6 @@ use Knp\Menu\ItemInterface as MenuItemInterface;
 /**
  *
  */
-/** @noinspection PhpDocSignatureInspection */
-/** @noinspection PhpDocSignatureInspection */
-/** @noinspection PhpDocSignatureInspection */
 interface AdminExtensionInterface
 {
     /**