Clarify that logout function is an addition

Hopefully adding ellipses will make it clearer that the logout function has been added to the angular app, not replacing it completely(!) Fixes spring-guidesgh-37

Author: Dave Syer

logout/README.adoc

@@ -34,8 +34,10 @@ JavaScript:
 ----
 angular
  .module("app", [])
+ ...
  .controller("home", function($http, $location) {
  var self = this;
+ ...
  self.logout = function() {
  $http.post('/logout', {}).success(function() {
  self.authenticated = false;