[Bug 192663] New: Incorrect info in handbook for carp on 10+

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192663

            Bug ID: 192663
           Summary: Incorrect info in handbook for carp on 10+
           Product: Documentation
           Version: Latest
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Many People
          Priority: ---
         Component: Documentation
          Assignee: freebsd-doc at FreeBSD.org
          Reporter: matt.home at userve.net

Section 18.14.2.1 notes that FreeBSD 10+ users should "replace carp0 with the
name of the CARP-configured interface." in the devd rules.

This is incorrect and makes no sense. Using the interface up/down rules are not
applicable at all, as carp is configured directly on the real interface. This
interface will be up on both master and backup machines in normal operation.
The user should use the new CARP devd rules specifically added for this
purpose. (As described in carp man page)

Less of an issue, but it also suggests editing /etc/devd.conf. Seeing as a
method is provided for the user to add their own rule files, and there appears
to be an effort to clean up the base config file (see recent efforts to group
rules into /etc/devd/*.conf files), it makes sense to me to tell users to
create their own /usr/local/etc/devd/carp.conf file. This provides a concise
place to store their carp specific rules and reduces the risk of causing
problems in the main devd,conf file.

This should probably be a separate bug but the devd.conf file also needs the
CARP rules adding to the list.

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