Merge pull request #25885 from sculley/fix-upgrade-kubeadm-docs-release-1.18

re-positioned drain/uncorden steps in kubeadm upgrade docs in release-1.18

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

@@ -91,13 +91,6 @@ Find the latest stable 1.18 version:
     kubeadm version
     ```
 
--  Drain the control plane node:
-
-    ```shell
-    # replace <cp-node-name> with the name of your control plane node
-    kubectl drain <cp-node-name> --ignore-daemonsets
-    ```
-
 -   On the control plane node, run:
 
     ```shell
@@ -244,13 +237,6 @@ For more information see the [certificate management guide](/docs/tasks/administ
 
     This step is not required on additional control plane nodes if the CNI provider runs as a DaemonSet.
 
--  Uncordon the control plane node:
-
-    ```shell
-    # replace <cp-node-name> with the name of your control plane node
-    kubectl uncordon <cp-node-name>
-    ```
-
 ### Upgrade additional control plane nodes
 
 Same as the first control plane node but use:
@@ -267,6 +253,15 @@ sudo kubeadm upgrade apply
 
 Also `sudo kubeadm upgrade plan` is not needed.
 
+###  Drain the control plane node
+
+- Prepare the node for maintenance by marking it unschedulable and evicting the workloads:
+
+    ```shell
+    # replace <cp-node-name> with the name of your control plane node
+    kubectl drain <cp-node-name> --ignore-daemonsets
+    ```
+
 ### Upgrade kubelet and kubectl
 
 Upgrade the kubelet and kubectl on all control plane nodes:
@@ -295,6 +290,15 @@ sudo systemctl daemon-reload
 sudo systemctl restart kubelet
 ```
 
+###  Uncordon the control plane node
+
+- Bring the node back online by marking it schedulable:
+
+    ```shell
+    # replace <cp-node-name> with the name of your control plane node
+    kubectl uncordon <cp-node-name>
+    ```
+
 ## Upgrade worker nodes
 
 The upgrade procedure on worker nodes should be executed one node at a time or few nodes at a time,
@@ -321,6 +325,14 @@ without compromising the minimum required capacity for running your workloads.
 {{% /tab %}}
 {{< /tabs >}}
 
+### Upgrade the kubelet configuration
+
+-  Call the following command:
+
+    ```shell
+    sudo kubeadm upgrade node
+    ```
+
 ### Drain the node
 
 -  Prepare the node for maintenance by marking it unschedulable and evicting the workloads:
@@ -338,14 +350,6 @@ without compromising the minimum required capacity for running your workloads.
     node/ip-172-31-85-18 drained
     ```
 
-### Upgrade the kubelet configuration
-
--  Call the following command:
-
-    ```shell
-    sudo kubeadm upgrade node
-    ```
-
 ### Upgrade kubelet and kubectl
 
 -  Upgrade the kubelet and kubectl on all worker nodes: