docs/victorialogs/vlagent.md: features chapter: mention that vlagent can discover and collect Kubernetes logs

Author: valyala

docs/victorialogs/vlagent.md

@@ -18,6 +18,7 @@ aliases:
 
 ## Features
 
+- `vlagent` can discover and collect logs generated by all the pods (containers) in Kubernetes. See [these docs](https://docs.victoriametrics.com/victorialogs/vlagent/#collect-kubernetes-pod-logs).
 - `vlagent` can accept logs from popular log collectors in the same way as VictoriaLogs does. See [these docs](https://docs.victoriametrics.com/victorialogs/data-ingestion/).
   It accepts logs over HTTP-based protocols at the TCP port `9429` by default. The port can be changed via `-httpListenAddr` command-line flag.
 - `vlagent` can replicate collected logs among multiple VictoriaLogs instances - see [these docs](https://docs.victoriametrics.com/victorialogs/vlagent/#replication-and-high-availability).