[ietf-dkim] Nits with section 3 Operation Overview

[Jim Fenton]

Arvel Hathcock wrote:
> Just one suggestion.    I would rewrite the second sentence like this:
>
>  "This practice would be used by those domains who wish to emphasize
> security over deliverability of their messages."
>
> and leave out the bit about what we think the typical use case for
> this might be.  In fact, since none of the other practice options
> provide a rational behind why they would be used I don't see the need
> to do so here either in which case the entire sentence could be
> removed.  Or perhaps a NON-NORMATIVE DISCUSSION section could be added
> where the possible use cases and cautions could be given.

I agree; I'm inclined to go with including it as a non-normative
discussion because I consider it important to describe the use case that
motivates the use of that practice.

-Jim