Hi, indeed our helpdesk guides on VR are outdated, sorry for this, we will update them ASAP!
The solution is:
-Use Corona Camera
-Select the Corona Camera > Projection & VR > Type > Spherical, Virtual Reality > Enable
-Set resolution to 1:1 ratio (e.g. 4096 x 4096 px)
-Render
Usually there is no need to change any other settings at all (like eye separation). Like the rest of Corona, this should work out of the box.
If you REALLY need to change something, you are free to do it. For example, you may need to lower the eye offset if you want to make the viewer feel "smaller" compared to the environment (or in other words - to make the enviro feel less claustrophobic - e.g. interior of a car), or increase it to make him feel bigger.