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Also re-organize the structure of the doc to make it a bit more logical.

Bug: 1094512
Change-Id: I230de88902da3d4162af5f10332f7262a8465fcd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363303
Commit-Queue: Robert Ma <robertma@chromium.org>
Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799367}