Clarify about ARM template

Customers run ARM template to migrate without specifying CE settings thinking it would remove CE settings, but it does not. Customers MUST remove Continuous Export (CE) settings before kicking off the ARM templates and just want to make sure customers discover this requirement when clicking on ARM template link. Had a big customer call in about this expecting ARM template to remove CE, but it does not, that's still on customers to manually perform.

Author: toddfoust

articles/azure-monitor/app/convert-classic-resource.md

@@ -198,7 +198,10 @@ Update-AzApplicationInsights -Name "aiName" -ResourceGroupName "rgName" -Ingesti
 
 ### Azure Resource Manager templates
 
-This section provides templates.
+This section provides templates. 
+
+   > [!CAUTION]
+   > Ensure that you have removed all Continous Export settings from your resource before running the migration templates. See [Prerequisites](#prerequisites) 
 
 #### Template file