anchor.diff:        transformationMatrix = mkOption {
           type = types.nullOr types.str;
           default = null;
  +        example = "0.5 0 0 0 0.8 0.1 0 0 1";
           description = ''
  -          A  string  of  9 space-separated floating point numbers.  Sets the transformation matrix to
  +          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).
           '';
         };
  
positive.code:       accelSpeed = mkOption {
          type = types.nullOr types.str;
          default = null;
          description = "Cursor acceleration (how fast speed increases from minSpeed to maxSpeed).";
        };
  
        buttonMapping = mkOption {
          type = types.nullOr types.str;
          default = null;
          description =
            ''
              Sets the logical button mapping for this device, see XSetPointerMapping(3). The string  must
  
negative.code:       clickMethod = mkOption {
          type = types.nullOr (types.enum [ "none" "buttonareas" "clickfinger" ]);
          default = null;
          example = "buttonareas";
          description =
            ''
              Enables a click method. Permitted values are <literal>none</literal>,
  