HID: Fix spelling mistakes "Kensigton" -> "Kensington"

There are spelling mistakes in a comment and in the module description.
Fix these.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://patch.msgid.link/20240711083513.282724-1-colin.i.king@gmail.com


Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>