Code review comment for ~mwhudson/curtin:document-ptable-raid

Yes, that looks good.

Let's add a short example with a partition:

** RAID Partition Example **::

# create RAID5 array /dev/md0 and first partition /dev/md0p1
- id: md0
   type: raid
   name: md0
   raidlevel: 5
   ptable: gpt
   devices:
     - sda1
     - sdb1
     - sdc1
   spare_devices:
     - sdd1
- id: md0p1
  type: partition
  device: md0
  size: 10G