remove unused import

Author: thomas-kl1

Model/DocumentType.php

@@ -13,7 +13,6 @@
 use Magento\Framework\Model\AbstractExtensibleModel;
 use Opengento\Document\Api\Data\DocumentTypeExtensionInterface;
 use Opengento\Document\Api\Data\DocumentTypeInterface;
-use function array_merge;
 use function explode;
 
 class DocumentType extends AbstractExtensibleModel implements DocumentTypeInterface, IdentityInterface