Update netstat.1 to give a notion of the existence of nexthops and nexthop groups

[zarychtam_plan-b.pwste.edu.pl]

Summary

Nexthops were introduced in fedeb08b6a58e and a666325282eae. Perhaps the users of FreeBSD want to see them in netstat(1). Let's stop hiding this valuable data from them.

Test Plan

netstat -o4
netstat -o4W
netstat -o6
netstat -o6W
netstat -O4
netstat -O6

[zarychtam_plan-b.pwste.edu.pl]

In the future FreeBSD will have ip(8) or it's analogue. Mentioning now these temporary -o -O in netstat(1) will probably bring more harm than benefit, so the -o and -O options should remain as options for insiders.

[danfe]

@zarychtam_plan-b.pwste.edu.pl wrote:

In the future FreeBSD will have ip(8) or it's analogue.

I hope not. Last year Alexander had conducted a poll in our local group, and while it's not 100% representative, vast majority of votes were to preserve the status quo. I won't mind (or care) having something like ip(8) in ports, but please don't plague the base system with this linuxish filth.