Merge pull request #21522 from raonitimo/patch-1

Fixing broken link to Certificate Management with kubeadm

Author: k8s-ci-robot

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

@@ -149,7 +149,7 @@ Find the latest stable 1.18 version:
 {{< note >}}
 `kubeadm upgrade` also automatically renews the certificates that it manages on this node.
 To opt-out of certificate renewal the flag `--certificate-renewal=false` can be used.
-For more information see the [certificate management guide](/docs/tasks/administer-cluster/kubeadmkubeadm-certs).
+For more information see the [certificate management guide](/docs/tasks/administer-cluster/kubeadm/kubeadm-certs).
 {{</ note >}}
 
 -  Choose a version to upgrade to, and run the appropriate command. For example:
@@ -442,4 +442,4 @@ and post-upgrade manifest file for a certain component, a backup file for it wil
 `kubeadm upgrade node` does the following on worker nodes:
 
 - Fetches the kubeadm `ClusterConfiguration` from the cluster.
-- Upgrades the kubelet configuration for this node.
+- Upgrades the kubelet configuration for this node.