Clarification re angular.mock.module

Make it explicit that it is calling the `angular.mock.module()` and not the `angular.module()` function. Same for `angular.mock.inject()`. This was not clear when I read the page.

It would be great if somebody could add a better explanation or a few comments to this page. I found it very hard to understand. I'd do it myself but I still don't really understand this code example ;)