docs(tutorial): inject phonecapApp module into unit test

When I was reading this doc I was thinking "but what about phonecatApp?" and when I looked in the
file from the step-11 branch there it is. Should be reflected in the docs as well

Closes angular#6209

Author: yono38

docs/content/tutorial/step_11.ngdoc

@@ -148,7 +148,7 @@ describe('PhoneCat controllers', function() {
     });
   });
 
-
+  beforeEach(module('phonecatApp'));
   beforeEach(module('phonecatServices'));