Update external-resources.ngdoc

[amandeepmittal]

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

No

Does this PR introduce a breaking change?
No

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:

add AngularJS in Action Book

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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.

---

• If you've already signed a CLA, it's possible we don't have your GitHub username or you're using a different email address. Check your existing CLA data and verify that your email is set on your git commits.
• If you signed the CLA as a corporation, please let us know the company's name.

[amandeepmittal]

I signed it!

[gkalpak]

@googlebot doesn't seem to think so. Have you verified that the email address you signed it with is what appears on the commits?

[amandeepmittal]

Yes, I did.

[googlebot]

CLAs look good, thanks!

[googlebot]

CLAs look good, thanks!