docs(observability): cite the right RFC-0001 node for the Grafana datasource

[vovinacci]

The comment above the Analytics Postgres datasource quoted RFC-0001's D5 edge as "grafana -->|historical dashboards| pgA". The RFC draws it to pgB (0001-polyglot-platform.md:98). pgA is the backend's db; Grafana never connects there, so the citation sent a reader to the wrong database while the config four lines below correctly targets postgres-analytics.

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