Improve wording of TpConnectionRequestHandlesCb, TpConnectionHoldHandlesCb docs
Improve wording of TpConnectionRequestHandlesCb, TpConnectionHoldHandlesCb docs

It was previously unclear whether it was the same pointer, or a pointer
to a copy.

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