Further difficult to read corrections/proposals under "Document conformance requirements..."

[rschristian]

Follow up to #529 as #531 seems to have introduced a few more issues.

In the Doc conformance table, there's a few elements with difficult to read notes:

• body
• button
• img
• input
• nav
• section

This mostly just appears to be inconsistency in class names, i.e., using proposal instead of proposed, using correction on its own instead of addition correction or correction proposed, etc. I don't quite know which classes need to be changed vs just added to this selector so I thought I'd raise an issue.