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This CL updates per-cl coverage documentation with percentages.

Change-Id: Ib39834a06dfb03b48f4f3449223ebfce91c6a52a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1876730
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709223}