superio/f71869ad: fix documentation of io_info mask values

Change-Id: I5d0a945de45f8f4a77193135e63f480af14a0136
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: http://review.coreboot.org/6279
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>

src/superio/fintek/f71869ad/superio.c

@@ -57,7 +57,7 @@ static struct device_operations ops = {
 };
 
 /*
- * io_info contains the mask 0x07f8. Given 16 register, each 8 bits wide of a
+ * io_info contains the mask 0x07f8. Given 8 register, each 8 bits wide of a
  * logical device we need a mask of the following form:
  *
  *  MSB                 LSB