Update readme.md

Author: CESARDELATORRE

deploy/az/servicefabric/LinuxContainers/readme.md

@@ -51,7 +51,7 @@ Now, if you go to your subscription in Azure, you should be able to see the SF c
 
 ![image](https://user-images.githubusercontent.com/1712635/31638398-3fc08ad8-b288-11e7-879b-fc4df0daad2b.png)
 
-In this case, this is an unsecured SF cluster with a single node, good for initial tests and getting started with SF.
+In this case, this is an unsecured SF cluster with a single Linux node, good for initial tests and getting started with SF.
 
 ## B. Secured cluster (SF Linux cluster)