Tidy trailing spaces and newlines

[djptek]

• Have you signed the contributor license agreement? Y
• Have you followed the contributor guidelines? Y
• For proposing substantial changes or additions to the schema, have you reviewed the RFC process? Y
• If submitting code/script changes, have you verified all tests pass locally using make test? Y
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• Have you added an entry to the CHANGELOG.next.md? Y

[ebeahan]

I forgot there were some fields with a footnote attribute!

I think this is good detail we should capture somehow in the documentation in addition to the schema.

[djptek]

@ebeahan I hadn't noticed that - does footnote still add value or could we add an RFC to merge existing footnotes into description? From what I've seen they are mostly usage examples