Alignment of Section 7 with the style used in the TLS BR

[srdavidson]

After the original publication of the S/MIME BR, the TLS BR changed the layout of its section 7 to provide a detailed set of schedules describing the allowed configuration of roots, ICAs, and leaf certificates.

@aww-aww proposes the WG consider aligning the section 7 of the S/MIME BR with the style now used in the TLS BR for consistency.

[srdavidson]

A draft is being compiled at https://github.com/cabforum/smime/tree/profiles.