clarify what the sample template does

Author: johnkemnetz

articles/virtual-machines/extensions/diagnostics-linux.md

@@ -84,7 +84,7 @@ my_lad_protected_settings="{'storageAccountName': '$my_diagnostic_storage_accoun
 az vm extension set --publisher Microsoft.Azure.Diagnostics --name LinuxDiagnostic --version 3.0 --resource-group $my_resource_group --vm-name $my_linux_vm --protected-settings "${my_lad_protected_settings}" --settings portal_public_settings.json
 ```
 
-The URL for the sample configuration, and its contents, are subject to change. Download a copy of the portal settings JSON file and customize it for your needs. Any templates or automation you construct should use your own copy, rather than downloading that URL each time.
+The sample configuration downloaded in these examples collects a set of standard data and sends them to table storage. The URL for the sample configuration and its contents are subject to change. In most cases, you should download a copy of the portal settings JSON file and customize it for your needs, then have any templates or automation you construct use your own version of the configuration file rather than downloading that URL each time.
 
 #### PowerShell sample