fixing missing word line 3

Author: RoseHJM

articles/lab-services/how-to-use-restrict-allowed-virtual-machine-sku-sizes-policy.md

@@ -1,6 +1,6 @@
 ---
 title: How to restrict the virtual machine sizes allowed for labs
-description: Learn how use the Lab Services should restrict allowed virtual machine SKU sizes Azure Policy to restrict educators to specified virtual machine sizes for their labs.  
+description: Learn how to use the Lab Services should restrict allowed virtual machine SKU sizes Azure Policy to restrict educators to specified virtual machine sizes for their labs.  
 ms.topic: how-to
 ms.author: rosemalcolm
 author: RoseHJM