Versions guide

[kwsp]

https://github.com/KhronosGroup/Vulkan-Guide/blob/main/chapters/versions.adoc

https://docs.vulkan.org/guide/latest/versions.html#_instance_and_device

It is important to remember there is a difference between the instance-level version and device-level version. It is possible that the loader and implementations will support different versions.

The guide doesn't clarify what's different between the instance-level version and the device-level version and how it affects the end user.