Added comment for dhcp client configure at Wi-SUN bootstrap.

Change-Id: I96dda88d47c6b230db8f83285bded84349c41cb1

Author: Juha Heiskanen

source/6LoWPAN/ws/ws_bootstrap.c

@@ -723,7 +723,7 @@ static int8_t ws_bootstrap_up(protocol_interface_info_entry_t *cur)
     cur->ipv6_neighbour_cache.send_nud_probes = false;
     cur->ipv6_neighbour_cache.probe_avoided_routers = true;
     dhcp_client_init(cur->id);
-    dhcp_client_configure(cur->id, true, true, true); //RENEW uses SOLICIT
+    dhcp_client_configure(cur->id, true, true, true); //RENEW uses SOLICIT, Interface will use 1 instance for address get, IAID address hint is not used.
     dhcp_client_solicit_timeout_set(cur->id, WS_DHCP_SOLICIT_TIMEOUT, WS_DHCP_SOLICIT_MAX_RT, WS_DHCP_SOLICIT_MAX_RC);