Clarifies the proper way to reference states
Clarifies the proper way to reference states

It seems in some situations, or in some earlier version, using a `/`
to reference sls files in subdirectories did work. However, because
of the inconsistency it caused occasional confusion. This updates the
tutorial to focus on the canonical `.` notation, which always works.

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt