Punctuation changes

Co-authored-by: Lubomir I. Ivanov <neolit123@gmail.com>

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

@@ -101,7 +101,7 @@ sudo apt update
 sudo apt-cache madison kubeadm
 ```
 
-If you don't see the version you expect to upgrade to, [verify which kubernetes package repositories are used](https://kubernetes.io/docs/tasks/administer-cluster/kubeadm/change-package-repository/#verifying-if-the-kubernetes-package-repositories-are-used)
+If you don't see the version you expect to upgrade to, [verify if the Kubernetes package repositories are used.](/docs/tasks/administer-cluster/kubeadm/change-package-repository/#verifying-if-the-kubernetes-package-repositories-are-used)
 
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