Update documentation link
Update documentation link

The KubeVirt documentation <http://kubevirt.io/docs/> that is part of
the new KubeVirt Web site had been already reconciled.  It is convenient
to adjust the user documentation URL, since the legacy User Guide
<http://kubevirt.io/user-guide/> is about to be deprecated.

kubevirt/kubevirt,stu-gott/kubevirt,stu-gott/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt,davidvossel/kubevirt,davidvossel/kubevirt,davidvossel/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt,davidvossel/kubevirt