[noise] Introduction paragraph

[Trevor Perrin]

On Mon, Oct 17, 2016 at 2:02 PM, Alex <alex at centromere.net> wrote:
> The intro reads:
>
> "Noise is a framework for crypto protocols based on Diffie-Hellman key
> agreement."
>
> Given that the patterns have been renamed, is this still accurate?

I think it's accurate enough for that document.  If postquantum or
signature extensions get more prominent in deployments or that spec,
we could change the description later.

Trevor