Pull up following revision(s) (requested by andvar in ticket #660):

sbin/ifconfig/ifconfig.8: revision 1.126
sbin/ifconfig/ifconfig.8: revision 1.127
sbin/ifconfig/ifconfig.8: revision 1.128
sbin/ifconfig/ifconfig.8: revision 1.129

Added documents about parameters related to lagg(4)
PR misc/58125

Correct a very minor typo (s/id/is/)

ifconfig(8): move laggportpri next to laggport

Update the date of the documentation to reflect recent changes.

(martin)