Rebalance Exit due to Bad Replicas Error has no support documentation

Rebalance exits with Bad Replicas which can be caused by ns_server or couchbase-bucket. In such situations, rebalance on re-try fails. To fix such an issue, we need manual intervention to diagnose the problem. For the support team we need to provide documentation as a part of our release notes. Please define a process for the same and then re-assign the bug to Ruth for adding it to our documentation for our release notes