Merge pull request #25788 from sculley/fix-kubeadm-upgrade-docs-1.20

moved drain the node step to after call kubeadm upgrade step for worker nodes

Author: k8s-ci-robot

content/en/docs/tasks/administer-cluster/kubeadm/kubeadm-upgrade.md

@@ -231,21 +231,21 @@ without compromising the minimum required capacity for running your workloads.
 {{% /tab %}}
 {{< /tabs >}}
 
-### Drain the node
+### Call "kubeadm upgrade"
 
--  Prepare the node for maintenance by marking it unschedulable and evicting the workloads:
+-  For worker nodes this upgrades the local kubelet configuration:
 
     ```shell
-    # replace <node-to-drain> with the name of your node you are draining
-    kubectl drain <node-to-drain> --ignore-daemonsets
+    sudo kubeadm upgrade node
     ```
 
-### Call "kubeadm upgrade"
+### Drain the node
 
--  For worker nodes this upgrades the local kubelet configuration:
+-  Prepare the node for maintenance by marking it unschedulable and evicting the workloads:
 
     ```shell
-    sudo kubeadm upgrade node
+    # replace <node-to-drain> with the name of your node you are draining
+    kubectl drain <node-to-drain> --ignore-daemonsets
     ```
 
 ### Upgrade kubelet and kubectl