[NVA] Fix update NVA connection cmdlet (#24957)

* fix routemap assignment

* add change log

* Update ChangeLog.md

It is recommended to put the changelog right below the #Upcoming Release title to avoid merge issue.

---------

Co-authored-by: NoriZC <[email protected]>

Author: rutuja-s

src/Network/Network/ChangeLog.md

@@ -19,6 +19,7 @@
 --->
 
 ## Upcoming Release
+* Fixed a bug in `Update-AzNetworkVirtualApplianceConnection`
 * Added cmdlet `New-AzVirtualApplianceNetworkProfile` to build network profile for network virtual appliance and pass as a parameter.
 * Added cmdlet `New-AzVirtualApplianceNetworkInterfaceConfiguration` and `New-AzVirtualApplianceIpConfiguration` to build `New-AzVirtualApplianceNetworkProfile`.
 * Added support for ApplicationGatewaySkuFamily 

src/Network/Network/NetworkVirtualAppliance/Connections/UpdateAzureNetworkVirtualConnectionCommand.cs.cs

@@ -157,7 +157,7 @@ public override void Execute()
 
                 if (this.RoutingConfiguration.OutboundRouteMap != null)
                 {
-                    nvaConnectionToModify.RoutingConfiguration.InboundRouteMap.Id = this.RoutingConfiguration.OutboundRouteMap.Id;
+                    nvaConnectionToModify.RoutingConfiguration.OutboundRouteMap.Id = this.RoutingConfiguration.OutboundRouteMap.Id;
                 }
                 else if (this.RoutingConfiguration.OutboundRouteMap == null)
                 {