ACPI: thinkpad-acpi: improve thinkpad-acpi input device documentation

Fix a few spelling errors, and also document the EV_SW events thinkpad-acpi
can issue.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>
1 file changed