New GLES3.1 vulkan tests were added to the bots. Add the results to the
ANGLE docs.

Bug: angleproject:3646
Change-Id: I503a00d38b570a1d8491acd8d1bac33723b2cbe4
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1688545Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>