docs(qa): correct six approvals checklist items the 18.0 sweep measured as inaccurate

Checklist-accuracy findings of QA run #24542 (approvals, 5b14b7f), each
re-derived from source at 8fbbd50: per-group-signoff,
quorum-m-of-n, decision-action-matrix, account-app-entry,
approver-resolution-matrix, request-page-reply-and-reader-visibility.
email-action-token-door and act-door-and-admin-rescue-slate are left
alone. One revision and one history row per item.

Claude-Session: https://claude.ai/code/session_01FM29ZqLTrnPNXxijioZwMp
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude