FreeBSD/doc 41b8401 (r52854)en_US.ISO8859-1/books/handbook/firewalls chapter.xml

Mention that FreeBSD does not ship with /etc/pf.conf by default.

Previous versions of FreeBSD provided a standard /etc/pf.conf, but
that was removed without changing the documentation.  Update the
handbook to mention it and point people to the directory
/usr/share/examples/pf/ where example firewall rules are available.

PR:                 231977
Submitted by:       koobs@
Discussed with:     kp@
DeltaFile
+5-4en_US.ISO8859-1/books/handbook/firewalls/chapter.xml
+5-41 files

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