Update Test Results docs with NUnit3 support

[fflaten]

Checklist

• [X] Issue has a meaningful title
• [X] I have searched the existing issues. See issues

Link to page

https://pester.dev/docs/usage/test-results#using-binpesterbat

What is the issue?

Update docs to mention NUnit3 support when pester/pester#2208 is merged. Maybe compare features between formats?

Related #200

Suggested fix?

No response