magento-engcom/import-export-improvements#135: update storage class from phpcs tests

Author: dmanners

app/code/Magento/CustomerImportExport/Model/ResourceModel/Import/Customer/Storage.php

@@ -13,6 +13,9 @@
 use Magento\ImportExport\Model\ResourceModel\CollectionByPagesIteratorFactory;
 use Magento\ImportExport\Model\ResourceModel\CollectionByPagesIterator;
 
+/**
+ * Storage to check existing customers.
+ */
 class Storage
 {
     /**
@@ -117,6 +120,8 @@ private function loadCustomersData(array $customerIdentifiers)
     }
 
     /**
+     * Add a customer by an array
+     *
      * @param array $customer
      * @return $this
      */