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This is a partial reland of
https://chromium-review.googlesource.com/c/chromium/src/+/1635827
for the documentation update (while not yet mandatory, it's already the
desired syntax while we fix the remaining straddlers).

TBR=fdoray@chromium.org

Bug: 968047
Change-Id: I7e897f4ecb2ba6075ba754695bbbd30ff0439de0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1759055
Commit-Queue: Gabriel Charette <gab@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688714}