Update link to zuul gating docs
Old link is broken.
Changes that have been approved by core reviewers are enqueued
in order in this pipeline, and if they pass tests, will be
merged. For documentation on how gating with Zuul works, please see
- https://zuul-ci.org/docs/zuul/user/gating.html
+ https://zuul-ci.org/docs/zuul/latest/gating.html
success-message: Build succeeded (gate pipeline).
failure-message: |
Build failed (gate pipeline). For information on how to proceed, see
