added nat gateway to table for zonal resource

Author: asudbring

articles/reliability/availability-zones-service-support.md

@@ -150,6 +150,7 @@ Azure offerings are grouped into three categories that reflect their _regional_
 | [Azure Monitor](../azure-monitor/logs/availability-zones.md)  | ![An icon that signifies this service is zone redundant.](media/icon-zone-redundant.svg) |
 | [Azure Monitor: Application Insights](../azure-monitor/logs/availability-zones.md)  | ![An icon that signifies this service is zone redundant.](media/icon-zone-redundant.svg) |
 | [Azure Monitor: Log Analytics](../azure-monitor/logs/availability-zones.md) | ![An icon that signifies this service is zone redundant.](media/icon-zone-redundant.svg) |
+| [Azure NAT Gateway](../nat-gateway/nat-availability-zones.md) | ![An icon that signifies this service is zonal](media/icon-zonal.svg) | 
 | [Azure Network Watcher](../network-watcher/frequently-asked-questions.yml) | ![An icon that signifies this service is zone redundant.](media/icon-zone-redundant.svg) |
 | [Azure Network Watcher: Traffic Analytics](../network-watcher/frequently-asked-questions.yml) | ![An icon that signifies this service is zone redundant.](media/icon-zone-redundant.svg) |
 | [Azure Notification Hubs](../notification-hubs/availability-zones.md) | ![An icon that signifies this service is zone redundant.](media/icon-zone-redundant.svg) |