Added ApiFilter and SearchFilter namespaces

Author: emnsen

core/filters.md

@@ -179,6 +179,8 @@ It is possible to filter on relations too, if `Offer` has a `Product` relation:
 namespace App\Entity;
 
 use ApiPlatform\Core\Annotation\ApiResource;
+use ApiPlatform\Core\Annotation\ApiFilter;
+use ApiPlatform\Core\Bridge\Doctrine\Orm\Filter\SearchFilter;
 
 /**
  * @ApiResource()