Document r263720, hostname- and IP-based restrictions added
to ctld(8).

Submitted by:	trasz
Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation
- Document 263725, ctld(8) 'portal-group' is overrideable.
- Document 263726, ctld(8) 'auth-group' default entry.

Submitted by:	trasz
Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation