Fix links in cluster-upgrade.md

Author: windsonsea

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

@@ -100,4 +100,4 @@ release with a newer device plugin API version, device plugins must be upgraded
 both version before the node is upgraded in order to guarantee that device allocations
 continue to complete successfully during the upgrade.
 
-Refer to [API compatiblity](/docs/concepts/extend-kubernetes/compute-storage-net/device-plugins.md/#api-compatibility) and [Kubelet Device Manager API Versions](/docs/reference/node/device-plugin-api-versions.md) for more details.
+Refer to [API compatiblity](/docs/concepts/extend-kubernetes/compute-storage-net/device-plugins/#api-compatibility) and [Kubelet Device Manager API Versions](/docs/reference/node/device-plugin-api-versions/) for more details.