AccountChannelRequest: remove invalid @see_also tag
AccountChannelRequest: remove invalid @see_also tag

Previously, gtk-doc complained of an illegal multi-line “Since:”
annotation, and omitted the cross-reference from the generated
documentation. @see_also is only legal in section headers, not in
function documentation.

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