adding comma to line 176

Author: schaffererin

articles/aks/upgrade-cluster.md

@@ -173,7 +173,7 @@ myAKSCluster  eastus      myResourceGroup  1.19.1               Succeeded
 With a list of available versions for your AKS cluster, use the [Set-AzAksCluster][set-azakscluster] cmdlet to upgrade. During the upgrade process, AKS will:
 
 - Add a new buffer node (or as many nodes as configured in [max surge](#customize-node-surge-upgrade)) to the cluster that runs the specified Kubernetes version.
-- [Cordon and drain][kubernetes-drain] one of the old nodes to minimize disruption to running applications. If you're using max surge it will [cordon and drain][kubernetes-drain] as many nodes at the same time as the number of buffer nodes specified.
+- [Cordon and drain][kubernetes-drain] one of the old nodes to minimize disruption to running applications. If you're using max surge, it will [cordon and drain][kubernetes-drain] as many nodes at the same time as the number of buffer nodes specified.
 - When the old node is fully drained, it will be reimaged to receive the new version, and it will become the buffer node for the following node to be upgraded.
 - This process repeats until all nodes in the cluster have been upgraded.
 - At the end of the process, the last buffer node will be deleted, maintaining the existing agent node count and zone balance.