Documentation: fix wrong value in md.txt

In the current Documentation/md.txt, the lower limit value of stripe_cache_size is 16 and the default value is 128, but when I update kernel to the latest mainline version and RAID5 array is created by mdadm, then execute the following commands, it shows an error and a difference respectively.

1) set stripe_cache_size to 16
[root@localhost ~]# echo 16 > /sys/block/md0/md/stripe_cache_size
bash: echo: write error: Invalid argument
2) read the default value of stripe_cache_size [root@localhost ~]# cat /sys/block/md0/md/stripe_cache_size 256

I read drivers/md/raid5.c and find the following related code:
1) in function 'raid5_set_cache_size':
if (size <= 16 || size > 32768)

	return -EINVAL;

2) #define NR_STRIPES 256

So the lower limit value of stripe_cache_size should be 17 and the default value should be 256.

---
 Documentation/md.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 1a2ada4..d6e2fcf 100644
@@ -602,7 +602,7 @@ These currently include
 
   stripe_cache_size  (currently raid5 only)
       number of entries in the stripe cache.  This is writable, but
-      there are upper and lower limits (32768, 16).  Default is 128.
+      there are upper and lower limits (32768, 17).  Default is 256.
   strip_cache_active (currently raid5 only)
       number of active entries in the stripe cache
   preread_bypass_threshold (currently raid5 only)

1.8.3.1

Applied to the docs tree, thanks.

jon