Update documentation about the _register_with_contacts_iface to _register_with_contacts_mixin change
Update documentation about the _register_with_contacts_iface to _register_with_contacts_mixin change

Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib