anchor.diff:          example = "/dev/input/event0";
           description =
             ''
  -            Path for ${deviceType} device.  Set to null to apply to any
  +            Path for ${deviceType} device.  Set to <literal>null</literal> to apply to any
               auto-detected ${deviceType}.
             '';
         };
  
positive.code:       transformationMatrix = mkOption {
          type = types.nullOr types.str;
          default = null;
          description = ''
            A  string  of  9 space-separated floating point numbers.  Sets the transformation matrix to
            the 3x3 matrix where the first row is (abc), the second row is (def) and the third row is (ghi).
          '';
        };
  
negative.code:         example = "flat";
          description =
            ''
              Sets the pointer acceleration profile to the given profile.
              Permitted values are <literal>adaptive</literal>, <literal>flat</literal>.
              Not all devices support this option or all profiles.
              If a profile is unsupported, the default profile for this is used.
              <literal>flat</literal>: Pointer motion is accelerated by a constant
  