docs(tutorial/4 - Directory and File Organization): describe your cha…

[ZachLamb]

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

What is the current behavior? (You can also link to an open issue here)

What is the new behavior (if this is a feature change)?

Does this PR introduce a breaking change?

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/angular/angular.js/blob/master/CONTRIBUTING.md#commit-message-format
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Other information:

…nge...

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[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ to sign.

Once you've signed, please reply here (e.g. I signed it!) and we'll verify. Thanks.

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[petebacondarwin]

Hi @ZachLamb can you sign the CLA please so that we can merge your PRs?

[ZachLamb]

@petebacondarwin , done. sorry about the delay!

[googlebot]

CLAs look good, thanks!

[googlebot]

CLAs look good, thanks!