message: Fix sentence & update link for GitLab CI docs
diff: @@ -47,7 +47,7 @@ rust-nightly:
  This will test on the stable channel and nightly channel, but any
  breakage in nightly will not fail your overall build. Please see the
  -[GitLab CI](https://docs.gitlab.com/ce/ci/yaml/README.html) for more
  +[GitLab CI documentation](https://docs.gitlab.com/ce/ci/yaml/index.html) for more
  information.
  ### builds.sr.ht
  