HID: hid-appletb-kbd: Fix wrong date and kernel version in sysfs interface docs

The driver hid-appletb-kbd was upstreamed in kernel 6.15. But, due to an
oversight on my part, I didn't change the kernel version and expected
date while upstreaming the driver, thus it remained as 6.5, the original
kernel version when the driver was developed for downstream. This commit
should fix this.

Signed-off-by: Aditya Garg <gargaditya08@live.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>