anchor.diff:          type = types.nullOr types.str;
           example = "/etc/vsftpd/userDb";
           default = null;
  -        description = ''
  -          Only applies if <option>enableVirtualUsers</option> is true.
  -          Path pointing to the <literal>pam_userdb</literal> user
  +        description = lib.mdDoc ''
  +          Only applies if {option}`enableVirtualUsers` is true.
  +          Path pointing to the `pam_userdb` user
             database used by vsftpd to authenticate the virtual users.
   
             This user list should be stored in the Berkeley DB database
  
positive.code:       type = types.bool;
        name = nixosName;
        value = mkOption {
          inherit description default;
          type = types.bool;
        };
      };
  
negative.code: 
            To generate a new user database, create a text file, add
            your users using the following format:
            ```
            user1
            password1
            user2
            password2
            ```
  
            You can then install `pkgs.db` to generate
            the Berkeley DB using
            ```
            db_load -T -t hash -f logins.txt userDb.db
            ```
  
            Caution: `pam_userdb` will automatically
            append a `.db` suffix to the filename you
            provide though this option. This option shouldn't include
            this filetype suffix.
          '';
  