docs(guide/bootstrap): fix link to angular.js  script in example
docs(guide/bootstrap): fix link to angular.js  script in example

code.angularjs.org/angular.js is 404, updated it

Updated http://code.angularjs.org/angular.js in the example to http://code.angularjs.org/snapshot/angular.js
It works fine now.

Closes #7807

ggershoni/angular.js,ggershoni/angular.js,ggershoni/angular.js,ggershoni/angular.js