openvpn: add warning about world-readable credentials

Changed files
+2
nixos
modules
services
networking
+2
nixos/modules/services/networking/openvpn.nix
···
description = ''
This option can be used to store the username / password credentials
with the "auth-user-pass" authentication method.
+
+
WARNING: Using this option will put the credentials WORLD-READABLE in the Nix store!
'';
type = types.nullOr (types.submodule {