Update how-to-enable-private-link-apim.md

I have try to deploy this with APIM deployed in the External virtual network mode and it didn't work.

"submissionTimestamp": "2025-02-20T16:56:02Z",,
    "properties": {
        "statusCode": "BadRequest",
        "serviceRequestId": null,
        "statusMessage": "{\"error\":{\"code\":\"NotSupported\",\"message\":\"Setting up Private Endpoint Connection for API Management service /subscriptions/####################/resourceGroups/sb1-shopping-global/providers/Microsoft.ApiManagement/service/ldv-sb1-shopping is not supported as it is setup in VirtualNetwork Type: External. Please disable Virtual Network on the service and try again.\"}}",

Author: Tchimwa

articles/frontdoor/standard-premium/how-to-enable-private-link-apim.md

@@ -22,7 +22,7 @@ This article guides you through the steps to configure an Azure Front Door Premi
 
 - An Azure account with an active subscription. [Create an account for free](https://azure.microsoft.com/free/?WT.mc_id=A261C142F).
 - Have a functioning Azure Front Door Premium profile and an endpoint. For more information on how to create an Azure Front Door profile, see [Create a Front Door](../create-front-door-portal.md).
-- Have a functioning Azure API Management instance. For more information on how to create an API Management instance, see [Create a new Azure API Management instance](../../api-management/get-started-create-service-instance.md)
+- Have a functioning Azure API Management instance deployed in public mode (Virtual Network mode will not work). For more information on how to create an API Management instance, see [Create a new Azure API Management instance](../../api-management/get-started-create-service-instance.md)
 
 ## Create an origin group and add the API Management instance as an origin
 
@@ -260,4 +260,4 @@ Your Azure Front Door profile is now fully functional after completing the final
 
 ## Next steps
 
-Learn about [Private Link service with storage account](../../storage/common/storage-private-endpoints.md).
+Learn about [Private Link service with storage account](../../storage/common/storage-private-endpoints.md).