docs(module): add link to mentioned resource

[gsklee]

Explicitly mentions Google DoubleClick team's presentation during ng-conf 2014 in place of the original vague wording.

Closes #6628

[mary-poppins]

Thanks for the PR! Please check the items below to help us merge this faster. See the contributing docs for more information.

• Uses the issue template (#6629)

If you need to make changes to your pull request, you can update the commit with git commit --amend.
Then, update the pull request with git push -f.

Thanks again for your help!

[lefos987]

Hi @gsklee I think that this document posted in Angular.js blog has the recommended app structure for angular apps.

[btford]

Ah, this is my bad. I meant to link to the blog @lefos987 mentions. This is what happens when you write docs at 1 in the morning. 💤

I'm going to edit the commit, but still credit @gsklee for catching my mistake.

[btford]

Landed as ed22869.