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Include an example of how to load IPv6 rules for ipfilter

Description

Include an example of how to load IPv6 rules for ipfilter

PR: 182218
Submitted by: debdrup
Reported by: pl@catslair.org
Sponsored by: Klara Inc.
Event: July 2020 Bugathon
Differential Revision: https://reviews.freebsd.org/D25624