docs(config): add analytics section to example configs

config.docker.example.json

@@ -88,5 +88,11 @@
     "share": 0.1,
     "reply": 0.03,
     "danmaku": 0.02
+  },
+  "analytics": {
+    "min_duration_seconds": 600,
+    "maturity_days": 14,
+    "min_view_for_efficiency": 0,
+    "shrink_minutes": null
   }
 }