Merge pull request #281918 from kgremban/aiojuly-review

M1 supported regions; architecture diagram fixes

Author: Stacyrch140

articles/iot-operations/deploy-iot-ops/howto-prepare-cluster.md

@@ -232,7 +232,7 @@ To connect your cluster to Azure Arc:
    export SUBSCRIPTION_ID=<SUBSCRIPTION_ID>
 
    # Azure region where the created resource group will be located
-   # Currently supported regions: "eastus", "eastus2", "westus", "westus2", "westus3", "westeurope", or "northeurope"
+   # Currently supported regions: "eastus", "eastus2", "westus", "westus2", "westeurope", or "northeurope"
    export LOCATION=<REGION>
 
    # Name of a new resource group to create which will hold the Arc-enabled cluster and Azure IoT Operations resources
@@ -242,6 +242,9 @@ To connect your cluster to Azure Arc:
    export CLUSTER_NAME=<NEW_CLUSTER_NAME>
    ```
 
+   >[!NOTE]
+   >West US 3 was a supported region in previous versions of Azure IoT Operations, but isn't supported with versions 0.6.x.
+
 1. Set the Azure subscription context for all commands:
 
    ```azurecli