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Some changes to the online HTML documentation based on discussions
and external feedback.

Bug: 955102
Change-Id: Ia9ad3bc0e33db17516eba5f0bd77c94ef067a26f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1577845
Commit-Queue: Adrian Taylor <adetaylor@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715919}