Update deploy.md postgres log command typo

the service for the log command for the db is doubled as backend. Must be postgres

docs/plone-deployment/deploy.md

@@ -92,7 +92,7 @@ Monitor the logs of each service with these commands:
 -   Traefik: `make stack-logs-webserver`
 -   Frontend: `make stack-logs-frontend`
 -   Backend: `make stack-logs-backend`
--   Backend: `make stack-logs-db`
+-   Postgres: `make stack-logs-db`
 
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