Merge pull request #4893 from zhangdb-git/master

📖 Fix incorrect indents

Author: k8s-ci-robot

docs/proposals/20200220-cluster-resource-set.md

@@ -219,7 +219,7 @@ kind: ClusterResourceBinding
 metadata:
   name: <cluster-name>
   namespace: <cluster-namespace>
- ownerReferences:
+  ownerReferences:
   - apiVersion: cluster.x-k8s.io/v1alpha3
     kind: Cluster
     name: <cluster-name>