IBX-8019: Added usage notice to LocationService::loadLocationChildren method

Author: webhdx

eZ/Publish/API/Repository/LocationService.php

@@ -97,6 +97,10 @@ public function loadLocations(ContentInfo $contentInfo, ?Location $rootLocation
     /**
      * Loads children which are readable by the current user of a location object sorted by sortField and sortOrder.
      *
+     * Use this method with caution. It performs heavy queries on the database. Consider using
+     * {@see \eZ\Publish\API\Repository\SearchService::findLocations()} as an alternative which
+     * uses Search Engine internally.
+     *
      * @param \eZ\Publish\API\Repository\Values\Content\Location $location
      * @param int $offset the start offset for paging
      * @param int $limit the number of locations returned