Update using-distributed-key-generation.md

[adir852]

Fix a typo in the README file

TIP: Before submitting your PR, don't hesitate to remove any placeholder text, possible empty sections, and this tip.

What:

Why:

How:

Checklist:

• Documentation
• Tests
• Ready to be merged
  

[github-actions]

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}

[olehnikolaiev]

lgtm