angular/angular.js — pull request #5318 by kurtfunai (2013-12-07 19:14:17+00:00)
Title: Update contribute.ngdoc

As mentioned in the Grunt docs:
http://gruntjs.com/getting-started

"In order to get started, you'll want to install Grunt's command line interface (CLI) globally. You may need to use sudo (for OSX, *nix, BSD etc) or run your command shell as Administrator (for Windows) to do this."