Fixing broken link

Author: schaffererin

articles/aks/use-system-pools.md

@@ -62,7 +62,7 @@ You can do the following operations with node pools:
 * You can delete system node pools, provided you have another system node pool to take its place in the AKS cluster.
 * An AKS cluster may have multiple system node pools and requires at least one system node pool.
 * If you want to change various immutable settings on existing node pools, you can create new node pools to replace them. One example is to add a new node pool with a new maxPods setting and delete the old node pool.
-* Use [node affinity](operator-best-practices-advanced-scheduler#node-affinity) to *require* or *prefer* which nodes can be scheduled based on node labels. You can set `key` to `kubernetes.azure.com`, `operator` to `In`, and `values` of either `user` or `system` to your YAML, applying this definition using `kubectl apply -f yourYAML.yaml`.
+* Use [node affinity][node-affinity] to *require* or *prefer* which nodes can be scheduled based on node labels. You can set `key` to `kubernetes.azure.com`, `operator` to `In`, and `values` of either `user` or `system` to your YAML, applying this definition using `kubectl apply -f yourYAML.yaml`.
 
 ## Create a new AKS cluster with a system node pool
 
@@ -356,3 +356,4 @@ In this article, you learned how to create and manage system node pools in an AK
 [maximum-pods]: configure-azure-cni.md#maximum-pods-per-node
 [update-node-pool-mode]: use-system-pools.md#update-existing-cluster-system-and-user-node-pools
 [start-stop-nodepools]: /start-stop-nodepools.md
+[node-affinity]: operator-best-practices-advanced-scheduler.md#node-affinity