Update tiếng việt transaction-fees.md

[ngoccha]

Update the Vietnamese version for learn/transaction-fees/ section.

[CLAassistant]

All committers have signed the CLA.

[github-actions[bot]]

CLA Assistant Lite bot:
Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

---

I have read the CLA Document and I hereby sign the CLA

---

_{You can retrigger this bot by commenting recheck in this Pull Request}

[scott-klaytn]

This update is to be merged into main by #687