trasnacted -> transacted in PRIMER.md

[shrugs]

No description provided.

[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project, in which case 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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• If you signed the CLA as a corporation, please let us know the company's name.

[shrugs]

I signed it, googlebot

[googlebot]

CLAs look good, thanks!