Added a reference link for pre-allocated huge pages

Author: jherrman

modules/virt-configuring-huge-pages-for-vms.adoc

@@ -22,7 +22,7 @@ If you edit a running virtual machine, the virtual machine must be rebooted for
 
 .Prerequisites
 
-* Nodes must have pre-allocated huge pages configured.
+* Nodes must have pre-allocated huge pages configured. For instructions, see link:https://docs.openshift.com/container-platform/{product-version}/scalability_and_performance/what-huge-pages-do-and-how-they-are-consumed-by-apps.html#configuring-huge-pages_huge-pages[Configuring huge pages at boot time].
 
 .Procedure