docs: update docs of README.mds.

summary: update command docker compose to docker-compose.

prometheus-grafana/README.md

@@ -1,7 +1,9 @@
 ## Compose sample
+
 ### Prometheus & Grafana
 
 Project structure:
+
 ```
 .
 ├── compose.yaml
@@ -13,6 +15,7 @@ Project structure:
 ```
 
 [_compose.yaml_](compose.yaml)
+
 ```
 services:
   prometheus:
@@ -26,6 +29,7 @@ services:
     ports:
       - 3000:3000
 ```
+
 The compose file defines a stack with two services `prometheus` and `grafana`.
 When deploying the stack, docker compose maps port the default ports for each service to the equivalent ports on the host in order to inspect easier the web interface of each service.
 Make sure the ports 9090 and 3000 on the host are not already in use.
@@ -33,7 +37,7 @@ Make sure the ports 9090 and 3000 on the host are not already in use.
 ## Deploy with docker compose
 
 ```
-$ docker compose up -d
+$ docker-compose up -d
 Creating network "prometheus-grafana_default" with the default driver
 Creating volume "prometheus-grafana_prom_data" with default driver
 ...
@@ -46,6 +50,7 @@ Attaching to prometheus, grafana
 ## Expected result
 
 Listing containers must show two containers running and the port mapping as below:
+
 ```
 $ docker ps
 CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                    NAMES
@@ -60,6 +65,7 @@ Navigate to `http://localhost:3000` in your web browser and use the login creden
 Navigate to `http://localhost:9090` in your web browser to access directly the web interface of prometheus.
 
 Stop and remove the containers. Use `-v` to remove the volumes if looking to erase all data.
+
 ```
-$ docker compose down -v
+$ docker-compose down -v
 ```