Fix podman_login.py example name

[Apollo3zehn]

The second example in podman_login.py show the login for quay.io instead of the default registry.

[sshnaidm]

Thanks, please sign the commit with git -s to make DCO job happy.

[Apollo3zehn]

I hope it is fine now, had to figure out how to use my SSH key for signing (and I used git -S before realizing it should be git -s).

[sshnaidm]

Cool, it's good now.