This is the instruction to publish a new autorest package.
Autorest pull request validation will check that changes are being documented using rush change --verify.
This means that if the pull request include some changes to any packages you will have to run rush change to interactively describe what the changes are and how they affect the package(Major, minor, patch).
If you want to release an update you will then have to run rush publish -a. This will take all pending change files created with rush change, update the changelog and bump the package(s) version.
Then in the Pull Request make sure to add the Publish label to tell the validation that this is meant to publish and it will ignore the change check above.