user-guides: make AWS guide more clear for non-ignition login

[coremodule]

I have noticed on the AWS CoreOS user guide[0], there is no mention of what user to login as if the user does not spin up the machine with an ignition file. This is fairly confusing. Can this be changed/modified to show that the user can log into the machine using the “core” account?

[0] https://docs.fedoraproject.org/en-US/fedora-coreos/getting-started/

[lucab]

Thanks for the report. Yes I think we can add that, but the real fix would be documenting all of that a #23.

[lucab]

I think #81 should cover the immediate friction reported here.