Update network4-list.json

doc/api/network4-list.json

@@ -2,7 +2,7 @@
     "name": "network4-list",
     "brief": "The network4-list command is used to retrieve full list of currently configured shared networks.",
     "description": "See <xref linkend=\"command-networkX-list\"/>",
-    "support": [ "kea-dhcp4", "kea-dhcp6" ],
+    "support": [ "kea-dhcp4"],
     "avail": "1.3.0",
     "hook": "subnet_cmds",
     "cmd-syntax": "{