[ietf-dkim] Type in Section 6.3

[Eric Allman]

> One of our guys here spotted this today:
>
> Section 6.3 (page 37) in the INFORMATIVE IMPLEMENTER'S NOTE under
> item 3.
>
> "if the body hash does match, the entire signature must be
> considered to have failed"
>
> IMO it should be "if the body hash does not match..."

Picky, picky.  OK, if you insist.

eric