FreeBSD/doc 48f7eb6 (r52944)en_US.ISO8859-1/books/handbook/firewalls chapter.xml

Revert a sysrc to an echo as it due to invalid characters.

When running
    sysrc -f /etc/sysctl.conf net.inet.ip.fw.verbose_limit=5

it throws the following error:

    sysrc: net.inet.ip.fw.verbose_limit: name contains characters not allowed in
shell

Fix this by reverting to using an echo to add the sysctl to sysctl.conf.

Reported by:        Laurent Gilbert (lg.athome at free.fr)
Event:              Aberdeen hackathon 2019
DeltaFile
+1-1en_US.ISO8859-1/books/handbook/firewalls/chapter.xml
+1-11 files

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