added a missing url for preview

added this row --> |Azure Arc for Kubernetes container image download| 443 | `https://azurearcfork8sdev.azurecr.io`|  Appliance VM IPs need outbound connection. | Required to pull container images. |

Author: alt-key

articles/azure-arc/resource-bridge/includes/network-requirements.md

@@ -24,7 +24,8 @@ The firewall and proxy URLs below must be allowlisted in order to enable communi
 |ADHS telemetry service | 443 | `adhs.events.data.microsoft.com`| Appliance VM IPs need outbound connection. | Used periodically to send Microsoft required diagnostic data and telemetry from within the appliance VM. |
 |Microsoft events data service | 443 |`v20.events.data.microsoft.com`| Appliance VM IPs need outbound connection. | Used periodically to send Microsoft required diagnostic data from the Azure Stack HCI or Windows Server host. Used when telemetry is coming off Windows like Windows Server or HCI. |
 |Log collection for Arc Resource Bridge| 443 | `linuxgeneva-microsoft.azurecr.io`| Appliance VM IPs need outbound connection. | Push logs for Appliance managed components.|
-|Resource bridge components download| 443 | `kvamanagementoperator.azurecr.io`| Appliance VM IPs need outbound connection. | Required to pull artifacts for Appliance managed components.|
+|Azure Arc for Kubernetes container image download| 443 | `https://azurearcfork8sdev.azurecr.io`|  Appliance VM IPs need outbound connection. | Pull container images while ARB is in preview. |
+|Resource bridge components download| 443 | `kvamanagementoperator.azurecr.io`| Appliance VM IPs need outbound connection. | Pull artifacts for Appliance managed components.|
 |Microsoft Container Registry| 443 | `https://mcr.microsoft.com`| Management machine & Appliance VM IPs need outbound connection. | Download container images for Arc Resource Bridge.|
 |Microsoft open source packages manager| 443 | `packages.microsoft.com`| Appliance VM IPs need outbound connection. | Download Linux installation package.|
 |Custom Locations| 443 | `sts.windows.net`| Appliance VM IPs need outbound connection. | Required for use by the Custom Locations cluster extension.|