10553 ipadm.1m should document hostmodel property

*** 404,413 ****
--- 404,423 ----
                                              (never/passive/active) (TCP).
                       extra_priv_ports       Additional privileged ports
                                              (SCTP/TCP/UDP).
                       forwarding             Packet forwarding (on/off).
                       hoplimit               The IPv6 hoplimit.
+                      hostmodel              IP packet handling on multi-homed
+                                             systems (weak/strong/src-priority)
+                                             (IPv4/IPv6).  weak and strong
+                                             correspond to the model
+                                             definitions defined in RFC 1122.
+                                             src-priority is a hybrid mode
+                                             where outbound packets are sent
+                                             from the interface with the
+                                             packet's source address if
+                                             possible.
                       largest_anon_port      Largest ephemeral port
                                              (SCTP/TCP/UDP).
                       max_buf                Maximum receive or send buffer
                                              size (ICMP/SCTP/TCP/UDP).  This
                                              also sets the upper limit for the