AW docs: use gitiles features in markdown

This switches gitiles callouts to emphasize notes. This also fixes a
typo.

R=torne@chromium.org

Bug: 918221
Test: Upload to gerrit > open file > click "gitiles"
Change-Id: Ide74948eb391e306fad7895f7abda00c1029aa24
Reviewed-on: https://chromium-review.googlesource.com/c/1417353
Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623767}
1 file changed