Fix a typo, UIP_IPV6_CONF_MULTICAST, in a comment with UIP_CONF_IPV6_MULTICAST
Fix a typo, UIP_IPV6_CONF_MULTICAST, in a comment with UIP_CONF_IPV6_MULTICAST

arurke/contiki,arurke/contiki,MohamedSeliem/contiki,MohamedSeliem/contiki,arurke/contiki,MohamedSeliem/contiki,arurke/contiki,arurke/contiki,MohamedSeliem/contiki,arurke/contiki,arurke/contiki,MohamedSeliem/contiki,MohamedSeliem/contiki,MohamedSeliem/contiki