fix capitalization

Author: GitHubber17

articles/aks/certificate-rotation.md

@@ -88,7 +88,7 @@ Verify the certificates have been updated by running a `kubectl` command, which
 kubectl get no
 ```
 
-## Next Steps
+## Next steps
 
 This article showed you how to automatically rotate your cluster's certificates, CAs, and SAs. You can see [Best practices for cluster security and upgrades in Azure Kubernetes Service (AKS)][aks-best-practices-security-upgrades] for more information on AKS security best practices.
 
@@ -97,4 +97,4 @@ This article showed you how to automatically rotate your cluster's certificates,
 [az-aks-get-credentials]: /cli/azure/aks?view=azure-cli-latest#az-aks-get-credentials
 [az-extension-add]: /cli/azure/extension#az-extension-add
 [az-extension-update]: /cli/azure/extension#az-extension-update
-[aks-best-practices-security-upgrades]: operator-best-practices-cluster-security.md
+[aks-best-practices-security-upgrades]: operator-best-practices-cluster-security.md