[PATCH] minor doc fix for create-role

Hi,

I'm not subscribed to the list, so please include me directly if you want my attention. This is a "drive-by" patch as
itwere. 

Attached is a minor patch to fix the name param documentation for create role, just adding a direct quote from
user-manag.sgmltalking about what the role name is allowed to be.  I was searching for this information and figured the
referencepage should have it as well. 

Hope this helps,
-Tara