Add comments warning before a weird nomenclature in factories
Add comments warning before a weird nomenclature in factories

Child factories create parent devices. That can be quite
confusing so we better add comments warning developers about this
fact.

jkonecny12/blivet,rvykydal/blivet,rvykydal/blivet,vojtechtrefny/blivet,jkonecny12/blivet,rhinstaller/blivet,rhinstaller/blivet,vojtechtrefny/blivet