mod_devicetable: fix kdocs for ishtp_device_id

The kdocs were copied from another device_id struct and not adapted.

Fixes: fa443bc3

 ("HID: intel-ish-hid: add support for MODULE_DEVICE_TABLE()")
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>