Added a link for further info about Angular's DI on Tutorial, Step 7 - Routing & Multiple Views

Request Type: docs

How to reproduce: Visite the step 7 of the tutorial:
http://code.angularjs.org/1.3.0-beta.4/docs/tutorial/step_07

After reading "A Note About DI, Injector and Providers", DI on Angular was so clear to me.

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**Detailed Description:**

This article is fantastic and really helped on understanding how DI works on Angular. It may be useful to other beginners -- because, at first glance, this topic (DI on Angular) ended a little bit hazy for me.

**Other Comments:**