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Add a link to that doc in Tast test failure log snippets.

Will make failure snippets look like:
https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8904924613768986736/+/steps/chrome_all_tast_tests__with_patch__on_ChromeOS/0/logs/Deterministic_failure:_session.LogoutCleanup__status_FAILURE_/0

Bug: 923426
Change-Id: Id7d19fa94126a013763e6671cfc0cd8f6263c71b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1759234
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692275}