tests: Add postive test group to validatelayerdoc script
tests: Add postive test group to validatelayerdoc script

Change-Id: If8b1d81d4c755ba8fc409d141387291d0e7d813d

KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers