Add new supported persona to the 3PAR docs

Adding the additional persona type '12 - OpenVMS' to the list of
supported valid persona values. Also, cleaned up the next space
between the items in the list and the commas.

Change-Id: I047898dc91df6e39fc2e4c70f3d2bbcc7ad15bad
Fixes: bug 1207912
Merge "Add new supported persona to the 3PAR docs"