(AzureCXP) fixed Bash sample

update Bash sample
resolves MicrosoftDocs/azure-docs#106767

Author: MayankBargali-MSFT

articles/container-apps/disaster-recovery.md

@@ -113,7 +113,7 @@ Next, query for the infrastructure subnet ID.
 # [Bash](#tab/bash)
 
 ```bash
-INFRASTRUCTURE_SUBNET=`az network vnet subnet show --resource-group <RESOURCE_GROUP_NAME> --vnet-name <VNET_NAME> --name infrastructure-subnet --query "id" -o tsv | tr -d '[:space:]'`
+INFRASTRUCTURE_SUBNET=`az network vnet subnet show --resource-group <RESOURCE_GROUP_NAME> --vnet-name <VNET_NAME> --name infrastructure --query "id" -o tsv | tr -d '[:space:]'`
 ```
 
 # [Azure PowerShell](#tab/azure-powershell)