update to tell customers that MS doesn't provide official support

[axelgMS]

1- [email protected] isn't a valid address anymore 2- from CRI 71338271 - it looks like nobody owns or supports https://github.com/Azure/azure-devops-utils/blob/master/quickstart_template/301-jenkins-acr-spinnaker-k8s.sh from Microsoft - so we should add a disclaimer saying that no official Support from Microsoft can be provided.