Updated region tags for docs: pull and acknowledge

[ellenevans]

No description provided.

[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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[ellenevans]

Another comment.

[googlebot]

CLAs look good, thanks!

[ellenevans]

I can try another comment

[ace-n]

Marking as obsolete, per our conversation offline.