Update prerequisites and section title in guide

Author: jmmason70

articles/operator-nexus/howto-cluster-runtime-upgrade.md

@@ -16,11 +16,11 @@ This how-to guide explains the steps for installing the required Azure CLI and e
 
 ## Prerequisites
 
-1. The [Install Azure CLI](/cli/azure/install-azure-cli) must be installed.
-2. The `networkcloud` CLI extension is required. If the `networkcloud` extension isn't installed, it can be installed following the steps listed [here](./howto-install-cli-extensions.md).
-3. Access to the Azure portal for the target cluster to be upgraded.
-4. You must be logged in to the same subscription as your target cluster via `az login`
-5. Target cluster must be in a running state, with all control plane nodes healthy and 80+% of compute nodes in a running and healthy state.
+- The [Install Azure CLI](/cli/azure/install-azure-cli) must be installed.
+- The `networkcloud` CLI extension is required. If the `networkcloud` extension isn't installed, it can be installed following the steps listed [here](./howto-install-cli-extensions.md).
+- Access to the Azure portal for the target cluster to be upgraded.
+- You must be logged in to the same subscription as your target cluster via `az login`
+- Target cluster must be in a running state, with all control plane nodes healthy and 80+% of compute nodes in a running and healthy state.
 
 ## Finding available runtime versions
 
@@ -138,7 +138,7 @@ In this example, if less than 10 compute nodes being provisioned in a rack fail
 > ***`update-strategy` cannot be changed after the cluster runtime upgrade has started.***
 > When a threshold value below 100% is set, it’s possible that any unhealthy nodes might not be upgraded, yet the “Cluster” status could still indicate that upgrade was successful. For troubleshooting issues with bare metal machines, please refer to [Troubleshoot Azure Operator Nexus server problems](troubleshoot-reboot-reimage-replace.md)
 
-## Upgrading cluster runtime using CLI
+## Upgrade cluster runtime using CLI
 
 To perform an upgrade of the runtime, use the following Azure CLI command: