anchor.diff:        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>,
  
positive.code:         example = "/dev/input/event0";
          description =
            ''
              Path for ${deviceType} device.  Set to null to apply to any
              auto-detected ${deviceType}.
            '';
        };
  
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
  