remove cluster name from readme

Author: jhorwit2

README.md

@@ -23,10 +23,7 @@ Create a config.yaml file with contents similar to the following. This file will
 information necessary to authenticate with the OCI APIs and provision block storage volumes.
 The `passphrase` field can be left out if your key has no passphrase.
 
-The `clusterName` field should match the cluster name specified with the kube-controller-manager, cloud-controller-manager and kube-apiserver.
-
 ```yaml
-clusterName: test
 auth:
   tenancy: ocid1.tenancy.oc1..aaaaaaaatyn7scrtwt...
   user: ocid1.user.oc1..aaaaaaaao235lbcxvdrrqlr...