acer-wmi: Fix DSDT path in documentation

Signed-off-by: NCarlos Corbacho <carlos@strangeworlds.co.uk>
Signed-off-by: NLen Brown <len.brown@intel.com>

Documentation/laptops/acer-wmi.txt

@@ -48,7 +48,7 @@ DSDT.
 
 To send me the DSDT, as root/sudo:
 
-cat /sys/firmware/acpi/DSDT > dsdt
+cat /sys/firmware/acpi/tables/DSDT > dsdt
 
 And send me the resulting 'dsdt' file.