Hi, when server starts it by default creates one vhost named '/'( so vhost is used anyway) and since we do not  support scenario with multiple vhosts I thought that it would be better to omit instructions about creating another vhost that could lead to some confusion.
In case you'd like to keep vhost instructions better to specify that, if you did not add any vhost, then when you'll  add a user, you will need to set its permissions to default vhost '/' anyway.