change recommend DN length by default

example/environment/env.example.php

@@ -99,7 +99,7 @@ define('MAGNET_DESCRIPTION_MIN_LENGTH', 0);
 define('MAGNET_DESCRIPTION_MAX_LENGTH', 10000);
 define('MAGNET_DESCRIPTION_REGEX', '/.*/ui');
 
-define('MAGNET_DN_MIN_LENGTH', 10);
+define('MAGNET_DN_MIN_LENGTH', 2);
 define('MAGNET_DN_MAX_LENGTH', 255);
 define('MAGNET_DN_REGEX', '/.*/ui');