util: explain why lm_message_node_get_child_with_namespace is bad
util: explain why lm_message_node_get_child_with_namespace is bad

Ziemin/telepathy-gabble,mlundblad/telepathy-gabble,Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,mlundblad/telepathy-gabble,Ziemin/telepathy-gabble,mlundblad/telepathy-gabble