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The current link goes to a generic APP FAQ, but we can link to the specific
section related to Advanced Protection download warnings.

This fixes b/153866355

Change-Id: I449e4d627fb70ac295fa6937a40c89a1e3879bfa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2250824
Auto-Submit: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Xinghui Lu <xinghuilu@chromium.org>
Commit-Queue: Xinghui Lu <xinghuilu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779581}