Clang-Tidy: Fix the HTML heading

This CL changes the original Android specific HTML heading to the format
of "Warnings of R{chrome_version}-{board_name}-{architecture}".

BUG=chromium:974401
TEST=successfully generate the html file with correct heading

Change-Id: Iae29b05edec1fc16977722f2f91c14d52e305aaf
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/1664758
Reviewed-by: George Burgess <gbiv@chromium.org>
Reviewed-by: Caroline Tice <cmtice@chromium.org>
Tested-by: Elaina Guan <ziyig@google.com>
1 file changed