[xcbf] CS Ballot text comment

Omission:
I need to add a section, just after 5.1.2.1.1 Digital Signature
process, or a paragraph that describes the associated digital
signature verification process.

Omission:
I need to add a section, just after 5.1.2.3.1 Message digest
and signature process, or a paragraph that describes the
associated signed data verification process.

Phil