docs(tutorial): fix typos in steps 2 and 3

docs/content/tutorial/step_02.ngdoc

@@ -178,7 +178,7 @@ execute the tests and report the results in the terminal.
 
 * Create a new model property in the controller and bind to it from the template. For example:
 
-          this.hello = "Hello, World!"
+          $scope.hello = "Hello, World!"
 
   Refresh your browser to make sure it says, "Hello, World!"
 

docs/content/tutorial/step_03.ngdoc

@@ -35,7 +35,7 @@ __`app/index.html`:__
    Fulltext Search: <input ng-model="query">
 
   <ul class="phones">
-    <li ng-repeat="phone in phones | filter(query)">
+    <li ng-repeat="phone in phones | filter:query">
       {{phone.name}}
       <p>{{phone.snippet}}</p>
     </li>