v0.35.2 lwconf, doc and deploy update

doc/configuration.md

@@ -172,8 +172,8 @@ Options, each as type and default:
   timestamp; the `raw` format shows neither.
 - `include_stats` (bool, `false`): add `type = "heartbeat"`, `beat_count` and,
   from the second beat, the measured `interval_ms` as fields.
-- `format` (string, `txt`): `txt`, `json` or `raw`; no effect: heartbeats go
-  through the flow's `format`.
+- `format` (string, `txt`): `txt`, `json` or `raw`, kept for older files:
+  heartbeats go through the flow's `format`.
 
 Heartbeats are ordinary entries with source `heartbeat` and level `INFO`. They
 are generated after the flow's filter and rate-limit stages, so filters do not