layers: Update details doc for new LVT
layers: Update details doc for new LVT

Added RenderPassClearOpTooManyValues and new error enum.

Change-Id: I598e7adf3897996efcf2f9c3023521e710b06cc6

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