sony-laptop: Update docs

Update documentation to be consistent with current implementation
(backlight subsys and platform_device).

Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 009aff8..d7e8969 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -93,14 +93,14 @@
 	depends on X86 && ACPI
 	select BACKLIGHT_CLASS_DEVICE
 	  ---help---
-	  This mini-driver drives the ACPI SNC device present in the
-	  ACPI BIOS of the Sony Vaio laptops.
+	  This mini-driver drives the SNC device present in the ACPI BIOS of
+	  the Sony Vaio laptops.
 
-	  It gives access to some extra laptop functionalities. In
-	  its current form, the only thing this driver does is letting
-	  the user set or query the screen brightness and remove/apply
-	  power to some devices.
+	  It gives access to some extra laptop functionalities. In its current
+	  form, this driver let the user set or query the screen brightness
+	  through the backlight subsystem and remove/apply power to some
+	  devices.
 
-	  Read <file:Documentation/acpi/sony_acpi.txt> for more information.
+	  Read <file:Documentation/sony-laptop.txt> for more information.
 
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