Match spec text.

[BigBlueHat]

• Update section comments to match spec.
• Fix up quotes in Status section.
• Fix up quote in Data Schemas section.
• Fix up quote in Verifiable Presentations section.

[BigBlueHat]

Working my way through the spec (again). More to come.

[PatStLouis]

Approving so far, please re-request another review from me once there's more included!

[BigBlueHat]

I'll put up another branch today with similar stuff. Thanks for the reviews, y'all!