The link that points to all known strings is outdated.

Change-Id: I40f7fd2b80fc0129eff5947ed6881d11934cb275
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1998084
Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
Reviewed-by: Anthony Polito <apolito@google.com>
Commit-Queue: Anthony Polito <apolito@google.com>