Update virtual-network-subnet-create-arm-template.md

Adding clarification on cross VNET move based on customer questions.

Author: suresh-kandoth

azure-sql/managed-instance/virtual-network-subnet-create-arm-template.md

@@ -33,7 +33,7 @@ Azure SQL Managed Instance must be deployed within an Azure [virtual network](/a
 > After a managed instance is created, moving the managed instance or virtual network to another resource group or subscription is not supported. 
  
 > [!IMPORTANT]
-> You can [move the instance to another subnet inside the Vnet](vnet-subnet-move-instance.md).
+> You can [move the instance to another subnet inside the Vnet](vnet-subnet-move-instance.md). Moving a managed instance from one subnet to another within the same VNET is allowed and supported. Moving a managed instance across VNET is not supported.
 
 ## Create a virtual network