Vulkan: Document that hex can be viewed with spirv-dis Since https://github.com/KhronosGroup/SPIRV-Tools/pull/5870, spirv-dis is able to disassemble SPIR-V given a hex stream. This change indicates this when retrieving shader debug info (a WebGL extension). Bug: angleproject:42266948 Change-Id: Ifab4668d6608093700d3e03ddd7ea675fd2bcf42 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5988173 Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org> Auto-Submit: Shahbaz Youssefi <syoussefi@chromium.org>