Update Important vSphere account section

customers are unaware about credential storage in Arc resource bridge. This impacts Day N experience as customers do not update the credentials in Arc VMware. Customers go so far as to delete and redeploy Arc resource bridge. This addition will inform customers of the storage of creds in Arc resource bridge and its usage in Arc VMware

Author: alt-key

articles/azure-arc/vmware-vsphere/support-matrix-for-arc-enabled-vmware-vsphere.md

@@ -36,10 +36,8 @@ 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]
-> If there are any changes to the credentials of the vSphere account after onboarding, follow these [steps](./administer-arc-vmware.md#updating-the-vsphere-account-credentials-using-a-new-password-or-a-new-vsphere-account-after-onboarding) to update the credentials in Arc Resource Bridge and VMware cluster extension. 
+> 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.
 
 ### Resource bridge resource requirements