docs: update docs of README.mds.

summary: update command docker compose to docker-compose.

portainer/README.md

@@ -1,13 +1,17 @@
 ## Portainer (CE)
+
 This example provides a base setup for using [Portainer](https://www.portainer.io/).
 More details on how to customize the installation and the compose file can be found in [portainer documentation](https://documentation.portainer.io/).
 
 ### Demo
+
 You can try out the public demo instance first: http://demo.portainer.io/
+
 - username: admin
 - password: tryportainer
 
 Project structure:
+
 ```
 .
 ├── compose.yaml
@@ -15,24 +19,26 @@ Project structure:
 ```
 
 [_compose.yaml_](compose.yaml)
-``` yaml
+
+```yaml
 services:
   portainer:
     image: portainer/portainer-ce:alpine
 ```
 
 ## Deploy with docker compose
+
 When deploying this setup, the web interface will be available on port 9000 (e.g. http://localhost:9000).
 
-``` shell
-$ docker compose up -d
+```shell
+$ docker-compose up -d
 Starting portainer ... done
 ```
 
-
 ## Expected result
 
 Check containers are running:
+
 ```
 $ docker ps
 CONTAINER ID   IMAGE                           COMMAND                  CREATED          STATUS                          PORTS                                                                                  NAMES
@@ -42,15 +48,16 @@ CONTAINER ID   IMAGE                           COMMAND                  CREATED
 
 Navigate to `http://localhost:9000` in your web browser to access the portainer web interface and create an account.
 
-
 Stop the containers with
-``` shell
-$ docker compose down
+
+```shell
+$ docker-compose down
 # To delete all data run:
-$ docker compose down -v
+$ docker-compose down -v
 ```
 
 ## Troubleshooting
+
 - Select the correct image for your OS. You can take a look at the published tags at [DockerHub](https://hub.docker.com/r/portainer/portainer-ce/tags)
-  
-> e.g. currently, the latest tag is for Windows (amd64) and alpine for Linux (amd64, arm/v7)
+
+> e.g. currently, the latest tag is for Windows (amd64) and alpine for Linux (amd64, arm/v7)