Code-review feedback on c334de0:
- Ingestion Paths intro said 'Three write paths' but the section has four
subsections (site hot-path append + 3 central writers). Reword to 'Four
paths feed the central AuditLog -- one site originator and three central
writers'.
- Purpose: 'dashboards plus drilldowns plus filter queries' read awkwardly;
switch to standard comma list.