add a comment explaining when gabble_tubes_channel_tube_offered is called and fix a typo in DEBUG msg
add a comment explaining when gabble_tubes_channel_tube_offered is called and fix a typo in DEBUG msg


20070531120136-7fe3f-1cdc1a9a42f7de77d587d20255abc3b6faa155b5.gz

community-ssu/telepathy-gabble,Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,mlundblad/telepathy-gabble,jku/telepathy-gabble,mlundblad/telepathy-gabble,Ziemin/telepathy-gabble,community-ssu/telepathy-gabble,Ziemin/telepathy-gabble,community-ssu/telepathy-gabble,community-ssu/telepathy-gabble,jku/telepathy-gabble,mlundblad/telepathy-gabble,jku/telepathy-gabble