Update helm-values-documenation.md (#1068)

Co-authored-by: Akshay Gupta <aksgupta@microsoft.com>

docs/helm-values-documenation.md

@@ -6,7 +6,7 @@
 | - | - | - |
 | `verbosityLevel`| 3 | Sets the verbosity level of the AGIC logging infrastructure. See [Logging Levels](troubleshooting.md#logging-levels) for possible values. |
 | `reconcilePeriodSeconds` | | Enable periodic reconciliation to checks if the latest gateway configuration is different from what it cached. Range: 30 - 300 seconds. Disabled by default. |
-| `appgw.applicationGatewayId` | | Resource Id of the Application Gateway. Example: `applicationgatewayd0f0` |
+| `appgw.applicationGatewayID` | | Resource Id of the Application Gateway. Example: `applicationgatewayd0f0` |
 | `appgw.subscriptionId` | Default is agent node pool's subscriptionId derived from CloudProvider config  | The Azure Subscription ID in which App Gateway resides. Example: `a123b234-a3b4-557d-b2df-a0bc12de1234` |
 | `appgw.resourceGroup` | Default is agent node pool's resource group derived from CloudProvider config | Name of the Azure Resource Group in which App Gateway was created. Example: `app-gw-resource-group` |
 | `appgw.name` | | Name of the Application Gateway. Example: `applicationgatewayd0f0` |
@@ -34,4 +34,4 @@ armAuth:
 
 rbac:
     enabled: false
-```
+```