[Bug 237694] route(8) manpage does not render correctly

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237694

            Bug ID: 237694
           Summary: route(8) manpage does not render correctly
           Product: Documentation
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Manual Pages
          Assignee: bugs at FreeBSD.org
          Reporter: wosch at FreeBSD.org
                CC: doc at FreeBSD.org

If you call the route(8) manpage then some parts of the page are not rendered
correctly due a groff issue.

how to reproduce:
$ zcat /usr/share/man/man8/route.8.gz | nroff -man >/dev/null
<standard input>:137: environment stack underflow
<standard input>:137: cannot chop empty macro


The problem is apparently at the line 137

.Cm flush Oc Oo Ar family Oc Op Fl fib Ar number


the expected result is:

     The flush command has the syntax:
           route [-n] flush [family] [-fib number]

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