Clarify the generation of device names.
Clarify the generation of device names.

Also, I noticed that the substitution should also happen on the group name.

apcera/chef-lvm,nitrous-io/lvm,laboshinl/lvm,ChiefAlexander/lvm,autoclone/lvm2,laboshinl/lvm,codio/lvm,bluestatedigital/lvm,hoteltonight/lvm,acm1/chef-lvm,apcera/chef-lvm,glensc/lvm,Altiscale/lvm,chef-cookbooks/lvm,acm1/chef-lvm,ClouDesire/lvm,chef-cookbooks/lvm,jtimberman/lvm,bryanwb/lvm,opscode-cookbooks/lvm,cookbooks/oc-lvm,autoclone/lvm,MMatten/lvm,susantomahato88/lvm,gionn/lvm,vtolstov/cb-lvm,osminog/lvm,ChiefAlexander/lvm,vtolstov/cb-lvm,ClouDesire/lvm,Altiscale/lvm,MarkGibbons/lvm,susantomahato88/lvm,andrewpsp/lvm,gionn/lvm,codio/lvm,DrillingInfo/lvm,autoclone/lvm,opscode-cookbooks/lvm,MarkGibbons/lvm,andrewpsp/lvm,glensc/lvm,MMatten/lvm,autoclone/lvm2