10553 ipadm.1m should document hostmodel property

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  .\"
  .\" Copyright (c) 2012, Joyent, Inc. All Rights Reserved
  .\" Copyright (c) 2013 by Delphix. All rights reserved.
  .\" Copyright 2018 Nexenta Systems, Inc.
  .\" Copyright (c) 2016-2017, Chris Fraire <cfraire@me.com>.
+ .\" Copyright 2019 OmniOS Community Edition (OmniOSce) Association.
  .\"
  .Dd February 6, 2018
  .Dt IPADM 1M
  .Os
  .Sh NAME
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  .It Cm forwarding
  Packet forwarding
  .Pq Cm on Ns / Ns Cm off .
  .It Cm hoplimit
  The IPv6 hoplimit.
+ .It Cm hostmodel
+ IP packet handling on multi-homed systems
+ .Pq Cm weak Ns / Ns Cm strong Ns / Ns Cm src-priority
+ .Pq IPv4/IPv6 .
+ .Cm weak
+ and
+ .Cm strong
+ correspond to the model definitions defined in RFC 1122.
+ .Cm src-priority
+ is a hybrid mode where outbound packets are sent from the interface with the
+ packet's source address if possible.
  .It Cm largest_anon_port
  Largest ephemeral port
  .Pq SCTP/TCP/UDP .
  .It Cm max_buf
  Maximum receive or send buffer size