layers: Fixup VUID ref in comment
layers: Fixup VUID ref in comment

Change-Id: I7baf4a5979bd3acf67fc9c3d722ed8c9584f27a0

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools