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

[Doug Otis]

7. RFC4871 Section 2.10 Agent or User Identifier (AUID)

Original Text:
  (None. Additional text.)
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.

Suggested correction:

A single domain name that may include additional sub-domains below the  
SDID and local-parts that identify the agent or user on behalf of whom  
the SDID has taken responsibility.


-Doug