TpChannel::group-contacts-changed signal's doc is wrong

Submitted by Guillaume Desmottes @gdesmott

Assigned to Telepathy bugs list

Link to original bug (#42594)

Description

I just wasted a lot of time debugging a crash which was due of the doc of this signal being wrong (one day we'll use a language having type safe signals, sigh...).

http://telepathy.freedesktop.org/doc/telepathy-glib/telepathy-glib-channel.html#TpChannel-group-contacts-changed

For some reason (gtk-doc bug?) the "details" GHashTable argument is missing.