(AzureCXP) Added note about 37 character limit in ASE naming

https://github.com/MicrosoftDocs/azure-docs/issues/51482

Author: Grace-MacJones-MSFT

articles/app-service/environment/create-ilb-ase.md

@@ -56,6 +56,9 @@ To create an ILB ASE:
 
     ![ASE creation](media/creating_and_using_an_internal_load_balancer_with_app_service_environment/createilbase.png)
 
+> [!NOTE]
+> The App Service Environment name must be no more than 37 characters.
+
 6. Select Networking
 
 7. Select or create a Virtual Network. If you create a new VNet here, it will be defined with an address range of 192.168.250.0/23. To create a VNet with a different address range or in a different resource group than the ASE, use the Azure Virtual Network creation portal. 
@@ -66,6 +69,7 @@ To create an ILB ASE:
 
 7. Select **Review and Create** then select **Create**.
 
+
 ## Create an app in an ILB ASE ##
 
 You create an app in an ILB ASE in the same way that you create an app in an ASE normally.