Merge "Docs: Adds validation-layer material to new Vulkan doc set" into mnc-docs am: b94ea2c am: d3867e5
am: 6adbc4d

* commit '6adbc4db3477e258dc99a2d85aceed2141149ae2':
  Docs: Adds validation-layer material to new Vulkan doc set

Change-Id: Ic0981a90eebbdbb80d09b284fc30b95aca2bea49