Update the Documentation for "acpi_backlight" by adding 2 new
options (native and none).
Signed-off-by: NRandy Dunlap <rdunlap@infradead.org>
Reviewed-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>