Fix doc (#9564)

Added line break to: "KUBECONFIG=/etc/kubernetes/admin.conf [NEWLINE HERE] kubectl ..."; Also added export to variables declaration.

content/en/docs/setup/independent/high-availability.md

@@ -285,12 +285,13 @@ done
 1.  Run the commands to add the node to the etcd cluster:
 
       ```sh
-      CP0_IP=10.0.0.7
-      CP0_HOSTNAME=cp0
-      CP1_IP=10.0.0.8
-      CP1_HOSTNAME=cp1
+      export CP0_IP=10.0.0.7
+      export CP0_HOSTNAME=cp0
+      export CP1_IP=10.0.0.8
+      export CP1_HOSTNAME=cp1
 
-      KUBECONFIG=/etc/kubernetes/admin.conf kubectl exec -n kube-system etcd-${CP0_HOSTNAME} -- etcdctl --ca-file /etc/kubernetes/pki/etcd/ca.crt --cert-file /etc/kubernetes/pki/etcd/peer.crt --key-file /etc/kubernetes/pki/etcd/peer.key --endpoints=https://${CP0_IP}:2379 member add ${CP1_HOSTNAME} https://${CP1_IP}:2380
+      export KUBECONFIG=/etc/kubernetes/admin.conf 
+      kubectl exec -n kube-system etcd-${CP0_HOSTNAME} -- etcdctl --ca-file /etc/kubernetes/pki/etcd/ca.crt --cert-file /etc/kubernetes/pki/etcd/peer.crt --key-file /etc/kubernetes/pki/etcd/peer.key --endpoints=https://${CP0_IP}:2379 member add ${CP1_HOSTNAME} https://${CP1_IP}:2380
       kubeadm alpha phase etcd local --config kubeadm-config.yaml
       ```
 
@@ -376,12 +377,13 @@ done
 1.  Run the commands to add the node to the etcd cluster:
 
       ```sh
-      CP0_IP=10.0.0.7
-      CP0_HOSTNAME=cp0
-      CP2_IP=10.0.0.9
-      CP2_HOSTNAME=cp2
+      export CP0_IP=10.0.0.7
+      export CP0_HOSTNAME=cp0
+      export CP2_IP=10.0.0.9
+      export CP2_HOSTNAME=cp2
 
-      KUBECONFIG=/etc/kubernetes/admin.conf kubectl exec -n kube-system etcd-${CP0_HOSTNAME} -- etcdctl --ca-file /etc/kubernetes/pki/etcd/ca.crt --cert-file /etc/kubernetes/pki/etcd/peer.crt --key-file /etc/kubernetes/pki/etcd/peer.key --endpoints=https://${CP0_IP}:2379 member add ${CP2_HOSTNAME} https://${CP2_IP}:2380
+      export KUBECONFIG=/etc/kubernetes/admin.conf 
+      kubectl exec -n kube-system etcd-${CP0_HOSTNAME} -- etcdctl --ca-file /etc/kubernetes/pki/etcd/ca.crt --cert-file /etc/kubernetes/pki/etcd/peer.crt --key-file /etc/kubernetes/pki/etcd/peer.key --endpoints=https://${CP0_IP}:2379 member add ${CP2_HOSTNAME} https://${CP2_IP}:2380
       kubeadm alpha phase etcd local --config kubeadm-config.yaml
       ```