starscan/README.md: Fix links

Bug: 11297512
Change-Id: I46403d75456b99d6ce6c32b27a5f5f9b6d1ab7ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2772975


Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Bartek Nowierski <bartekn@chromium.org>
Auto-Submit: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#865079}