Update diagnostics-linux.md

Author: cynthn

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

@@ -54,10 +54,10 @@ The downloadable configuration is just an example; modify it to suit your own ne
 
 ### Sample installation
 
-Fill in the correct values for the variables on the first three lines:
+Fill in the correct values for the variables in the first section before running:
 
 ```bash
-# Set your Azure VM diagnostic parameters correctly below
+# Set your Azure VM diagnostic variables correctly below
 my_resource_group=<your_azure_resource_group_name_containing_your_azure_linux_vm>
 my_linux_vm=<your_azure_linux_vm_name>
 my_diagnostic_storage_account=<your_azure_storage_account_for_storing_vm_diagnostic_data>