Update _previewpage

Author: vikram-redhat

scripts/ocpdocs/_previewpage

@@ -58,7 +58,7 @@
                             <div class="list-group">
                                 <p>
                                     <a role="button" class="btn btn-primary" href="/openshift-aro/latest/welcome/index.html">
-                                        <i class="fa fa-arrow-circle-o-right"></i> Dedicated</a>
+                                        <i class="fa fa-arrow-circle-o-right"></i> ARO</a>
                                 </p>
                                 <p class="list-group-item-text">Azure Red Hat OpenShift</p>