docs: update docker env description

deployment/docker/README.md

@@ -1,19 +1,19 @@
-### Folder contains basic images and tools for building and running Victoria Metrics in docker
+# Docker compose environment for VictoriaMetrics
 
-#### Docker compose
-
-To spin-up setup of VictoriaMetrics, vmagent and Grafana run following command:
+To spin-up VictoriaMetrics, vmagent, vmalert, Alertmanager and Grafana run the following command:
 
 `docker-compose up`
 
-##### VictoriaMetrics
+For clustered version check [docker compose in cluster branch](https://github.com/VictoriaMetrics/VictoriaMetrics/tree/master/deployment/docker).
 
-VictoriaMetrics opens following ports:
+## VictoriaMetrics
+
+VictoriaMetrics will be accessible on the following ports:
 * `--graphiteListenAddr=:2003`
 * `--opentsdbListenAddr=:4242`
 * `--httpListenAddr=:8428`
 
-##### vmagent
+## vmagent
 
 vmagent is used for scraping and pushing timeseries to
 VictoriaMetrics instance. It accepts Prometheus-compatible
@@ -21,7 +21,7 @@ configuration `prometheus.yml` with listed targets for scraping.
 
 [Web interface link](http://localhost:8429/).
 
-##### vmalert
+## vmalert
 
 vmalert evaluates alerting rules (`alerts.yml`) to track VictoriaMetrics 
 health state. It is connected with AlertManager for firing alerts,
@@ -29,14 +29,14 @@ and with VictoriaMetrics for executing queries and storing alert's state.
 
 [Web interface link](http://localhost:8880/).
 
-##### alertmanager
+## alertmanager
 
 AlertManager accepts notifications from `vmalert` and fires alerts.
 All notifications are blackholed according to `alertmanager.yml` config.
 
 [Web interface link](http://localhost:9093/).
 
-##### Grafana
+## Grafana
 
 To access service open following [link](http://localhost:3000).