remove the redundant space (#3420)

roles/kubernetes-apps/external_provisioner/cephfs_provisioner/README.md

@@ -40,7 +40,7 @@ kubectl create secret generic ceph-secret-admin --from-file=/tmp/secret --namesp
 The following example uses `cephfs-provisioner-1` as the identity for the instance and assumes kubeconfig is at `/root/.kube`. The identity should remain the same if the provisioner restarts. If there are multiple provisioners, each should have a different identity.
 
 ``` bash
-docker run -ti -v /root/.kube:/kube -v /var/run/kubernetes:/var/run/kubernetes --privileged --net=host  cephfs-provisioner /usr/local/bin/cephfs-provisioner -master=http://127.0.0.1:8080 -kubeconfig=/kube/config -id=cephfs-provisioner-1
+docker run -ti -v /root/.kube:/kube -v /var/run/kubernetes:/var/run/kubernetes --privileged --net=host cephfs-provisioner /usr/local/bin/cephfs-provisioner -master=http://127.0.0.1:8080 -kubeconfig=/kube/config -id=cephfs-provisioner-1
 ```
 
 Alternatively, deploy it in kubernetes, see [deployment](deploy/README.md).