Document VF link state control in the ip-link man page

Document the support added by commit 07fa9c15 "Add VF link state
control" in the ip-link man page.
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>

man/man8/ip-link.8.in

@@ -124,7 +124,8 @@ ip-link \- network device configuration
 .IR VLAN-QOS " ] ] ["
 .B rate
 .IR TXRATE " ] ["
-.B spoofchk { on | off }
+.B spoofchk { on | off } ] [
+.B state { auto | enable | disable}
 ] |
 .br
 .B master
@@ -576,6 +577,12 @@ parameter must be specified.
 .sp
 .BI spoofchk " on|off"
 - turn packet spoof checking on or off for the specified VF.
+.sp
+.BI state " auto|enable|disable"
+- set the virtual link state as seen by the specified VF. Setting to auto means a
+reflection of the PF link state, enable lets the VF to communicate with other VFs on
+this host even if the PF link state is down, disable causes the HW to drop any packets
+sent by the VF.
 .in -8
 
 .TP