[ietf-dkim] Update of RFC4871 Section 2.10 Agent or User Identifier (AUID) correction: (resent)

[Barry Leiba]

> Corrected Text:
>  A single domain name that identifies the agent or user on behalf of
> whom the SDID has taken responsibility. For DKIM processing, the
> domain name portion of the AUID has only basic domain name semantics;
> any possible owner-specific semantics is outside the scope of DKIM. It
> is specified in section 3.5.
>
> ### The AUID is not just a domain name.  It optionally includes a
> local-part.

Good one...
Dave is fixing this, along with a couple of nits that I encountered in
doing the PROTO write-up.

Barry (chair)