DOCS: Language reference - Domain modifiers - NS1_URLFWD

[cafferata]

The DNSControl language reference for the domain modifier NS1_URLFWD (for provider NS1) needs documentation. Who can help with this? 🙏

The current page shows:

NS1_URLFWD

Documentation needed.

[costasd]

Hi, I'll try to push something for this, been in my todo list for quite a while.