cosmetic bug in mdadm

mdadm --grow --help shows

  --raid-disks=  -n   : Change the number of active devices in an array.
                      : array.

but the manpage uses:

  --raid-devices

The latter should be preferred?
Also, a --grow fails without a spare or --backup-file, however
--backup-file is only in the manpage, not in the --help. That's pretty
minor but useful.



-- 
Jon