Fix codesearch links for cq-builders.md

* Package doesn't seem to work, so removed that.
* Quoted the builder names so it finds exact matches.
* Changed starlark filename

Change-Id: I09cee2593ef24c63a887d35cd2e6bf26e753c039
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3200059
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: Garrett Beaty <gbeaty@google.com>
Cr-Commit-Position: refs/heads/main@{#929382}