Add Important note to vSphere Account

Author: alt-key

articles/azure-arc/vmware-vsphere/quick-start-connect-vcenter-to-arc-using-script.md

@@ -55,7 +55,9 @@ You need a vSphere account that can:
 - Read all inventory. 
 - Deploy and update VMs to all the resource pools (or clusters), networks, and VM templates that you want to use with Azure Arc.
 
-This account is used for the ongoing operation of Azure Arc-enabled VMware vSphere and the deployment of the Azure Arc resource bridge VM.
+> [!IMPORTANT]
+> As part of the Azure Arc-enabled VMware onboarding script, you will be prompted to provide a vSphere account to deploy the Azure Arc resouce bridge VM on the ESXi host. This account will be stored locally within the Azure Arc resource bridge VM and encrypted as a Kubernetes secret at rest. The vSphere account allows Azure Arc-enabled VMware to interact with VMware vSphere. If your organization practices routine credential rotation, you must [update the credentials in Azure Arc-enabled VMware](administer-arc-vmware.md#updating-the-vsphere-account-credentials-using-a-new-password-or-a-new-vsphere-account-after-onboarding) to maintain the connection between Azure Arc-enabled VMware and VMware vSphere.
+
 
 ### Workstation