Missing pieces of puzzle in Tower configuration guide: no inventory for self-learner

[webknjaz]

I'm trying to go through this step and it happens to refer to some inventories, which don't exist in the repo.

/cc: @tima

[webknjaz]

I guess this one would work

[tima]

Thanks for pointing that out. We need to update that example sometime soon -- it's currently accurate if the lab was created by the AWS lab provisioner, but that doesn't mean we should do something better.

This issue is loosely related to #283.