Bug#898886: apt: Typo in proxy time out message

[Niels Thykier <niels@thykier.net>]

David Kalnischkies:
> So I guess we can split that message and go with something like
> 	Timed out while waiting to write %s to proxy %s.
> and
> 	Timed out while waiting to read %s from proxy %s.

Thanks; this suggestion sounds good to me. :)

Thanks,
~Niels