Add docs for publishing new operator versions to OperatorHub

docs/contributors-guide/release-process.md

@@ -8,3 +8,9 @@ After the draft release is created, publish it and the [Promote AWX Operator ima
 
 - Publish image to Quay
 - Release Helm chart
+
+After the GHA is complete, the final step is to run the [publish-to-operator-hub.sh](./hack/publish-to-operator-hub.sh) script, which will create a PR in the following repos to add the new awx-operator bundle version to OperatorHub:
+* https://github.com/k8s-operatorhub/community-operators (community operator index)
+* https://github.com/redhat-openshift-ecosystem/community-operators-prod (operator index shipped with Openshift)
+
+As soon as CI completes successfully, the PR's will be auto-merged. Please remember to monitor those PR's to make sure that CI passes, sometimes it needs a retry.