Update Tutorial step 8

The sentence on line 159  referenced parties-list.html which is wrong. It should reference parties-list.tpl.

Author: pieperz

.docs/angular-meteor/client/views/steps/tutorial.step_08.html

@@ -156,7 +156,7 @@ <h1>
 To access $rootScope inside a controller you add it through the dependency injection.
 To access $rootScope in a template you simply write $root. and then the name of the property.
 
-Change the code for the add button in parties-list.html to this:
+Change the code for the add button in parties-list.tpl to this:
 
     <button ng-click="newParty.owner=$root.currentUser._id; parties.push(newParty)">Add</button>