HID: magicmouse: fix kerneldoc for struct magicmouse_sc

Description for hdev, work and battery_timer of struct magicmouse_sc were
missing. Fix that.
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202312261056.AmFPDIL5-lkp@intel.com/Signed-off-by: Jiri Kosina <jkosina@suse.com>

drivers/hid/hid-magicmouse.c

@@ -120,6 +120,9 @@ MODULE_PARM_DESC(report_undeciphered, "Report undeciphered multi-touch state fie
  * @scroll_jiffies: Time of last scroll motion.
  * @touches: Most recent data for a touch, indexed by tracking ID.
  * @tracking_ids: Mapping of current touch input data to @touches.
+ * @hdev: Pointer to the underlying HID device.
+ * @work: Workqueue to handle initialization retry for quirky devices.
+ * @battery_timer: Timer for obtaining battery level information.
  */
 struct magicmouse_sc {
 	struct input_dev *input;