fix typos "wich" -> "which"

Signed-off-by: Uwe Zeisberger <zeisberg@informatik.uni-freiburg.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 82710ae..5cb9630 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -256,7 +256,8 @@
 	depends on ACPI_CUSTOM_DSDT
 	default ""
 	help
-	  Enter the full path name to the file wich includes the AmlCode declaration.
+	  Enter the full path name to the file which includes the AmlCode
+	  declaration.
 
 config ACPI_BLACKLIST_YEAR
 	int "Disable ACPI for systems before Jan 1st this year" if X86_32