Add generated dEQP charts to the ANGLE doc. Also clean up the comments formatting for generate_stats.py Bug: angleproject:3369 Change-Id: Ifaa26cb898915038cf47e88341db5057b59dd937 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1588315 Commit-Queue: Jonah Ryan-Davis <jonahr@google.com> Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Yuly Novikov <ynovikov@chromium.org>