docs(tutorial/step-05): fix path for 'phones.json'

Closes angular#5460

Author: Daniel

docs/content/tutorial/step_05.ngdoc

@@ -66,7 +66,7 @@ phonecatApp.controller('PhoneListCtrl', function ($scope, $http) {
 });
 ```
 
-`$http` makes an HTTP GET request to our web server, asking for `phone/phones.json` (the url is
+`$http` makes an HTTP GET request to our web server, asking for `phones/phones.json` (the url is
 relative to our `index.html` file). The server responds by providing the data in the json file.
 (The response might just as well have been dynamically generated by a backend server. To the
 browser and our app they both look the same. For the sake of simplicity we used a json file in this