GitLab

Also fix the mappings to actually appear when viewing the doc as markdown.

Change-Id: Ie68a1651a95b2876dcea1fe31a7aea54c872d2b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2350250Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Chris Sharp <csharp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797369}