anchor.diff:  
         devices = mkOption {
           default = [];
  -        example = [ "/dev/hda" ];
  +        example = [ "/dev/disk/by-id/wwn-0x500001234567890a" ];
           type = types.listOf types.str;
           description = ''
             The devices on which the boot loader, GRUB, will be
  
positive.code:       mirroredBoots = mkOption {
          default = [ ];
          example = [
            { path = "/boot1"; devices = [ "/dev/sda" ]; }
            { path = "/boot2"; devices = [ "/dev/sdb" ]; }
          ];
          description = ''
            Mirror the boot configuration to multiple partitions and install grub
  
negative.code: 
        device = mkOption {
          default = "";
          example = "/dev/disk/by-id/wwn-0x500001234567890a";
          type = types.str;
          description = ''
            The device on which the GRUB boot loader will be installed.
  