Fix spelling mistake

Fix spelling mistake

src/Umbraco.Web.UI.Client/src/common/services/navigation.service.js

@@ -463,7 +463,7 @@ function navigationService($rootScope, $routeParams, $log, $location, $q, $timeo
 
                     //if it is not two parts long then this most likely means that it's a legacy action
                     var js = action.metaData["jsAction"].replace("javascript:", "");
-                    //there's not really a different way to acheive this except for eval
+                    //there's not really a different way to achieve this except for eval
                     eval(js);
                 }
                 else {

src/Umbraco.Web.UI.Client/src/controllers/navigation.controller.js

@@ -11,7 +11,7 @@
  */
 function NavigationController($scope, $rootScope, $location, $log, $routeParams, $timeout, appState, navigationService, keyboardService, dialogService, historyService, eventsService, sectionResource, angularHelper) {
 
-    //TODO: Need to think about this and an nicer way to acheive what this is doing.
+    //TODO: Need to think about this and an nicer way to achieve what this is doing.
     //the tree event handler i used to subscribe to the main tree click events
     $scope.treeEventHandler = $({});
     navigationService.setupTreeEvents($scope.treeEventHandler);

src/Umbraco.Web/Templates/TemplateRenderer.cs

@@ -169,7 +169,7 @@ private void ExecuteTemplateRendering(TextWriter sw, PublishedContentRequest con
         /// </param>
         /// <returns></returns>
         /// <remarks>
-        /// To acheive this we temporarily change the output text writer of the current HttpResponse, then
+        /// To achieve this we temporarily change the output text writer of the current HttpResponse, then
         ///   execute the controller via the handler which innevitably writes the result to the text writer
         ///   that has been assigned to the response. Then we change the response textwriter back to the original
         ///   before continuing .