Update step_03.ngdoc

docs/content/tutorial/step_03.ngdoc

@@ -171,6 +171,9 @@ Let's see how we can get the current value of the `query` model to appear in the
         });
 
         it('should display the current filter value in the title bar', function() {
+
+          var query = element(by.model('query'));
+
           query.clear();
           expect(browser.getTitle()).toMatch(/Google Phone Gallery:\s*$/);