fix comment

src/Contracts/PayableEntity.php

@@ -49,7 +49,7 @@ interface PayableEntity
     public function getBillDescription(): string;
 
     /**
-     * Get ISO 4214 currency code, payment gateway driver need to
+     * Get ISO 4217 currency code, payment gateway driver need to
      * convert if different standard is used.
      *
      * @return string