Merge pull request #1210 from falkenbt/patch-1

Extend tooltip for drilldown link

src/app/features/panellinkeditor/module.html

 <div class="editor-row">
   <div class="section">
-		<h5>Drilldown / detail link<tip>These links appear in the dropdown menu in the panel menu</tip></h5>
+		<h5>Drilldown / detail link<tip>These links appear in the dropdown menu in the panel menu. Use var-variableName=value in params to pass templating variables.</tip></h5>
 
 		<div class="grafana-target" ng-repeat="link in panel.links"j>
 			<div class="grafana-target-inner">