doc: Move note in README.md higher for visibility (#10450)

The note detailing `docker compose` use for Docker's compose v2 plugin should be higher in the README since the document's first bash snippet includes `docker-compose up --build` which uses the "docker-compose" syntax.

This way the relevant note is readily visible above the first mention of "docker-compose" so skimmers trying to get the explorer up and running are immediately informed of the difference

docker-compose/README.md

@@ -10,6 +10,8 @@ Runs Blockscout locally in Docker containers with [docker-compose](https://githu
 
 ## Building Docker containers from source
 
+**Note**: in all below examples, you can use `docker compose` instead of `docker-compose`, if compose v2 plugin is installed in Docker.
+
 ```bash
 cd ./docker-compose
 docker-compose up --build
@@ -38,8 +40,6 @@ and 5 containers for microservices (written in Rust):
 
 The repo contains built-in configs for different JSON RPC clients without need to build the image.
 
-**Note**: in all below examples, you can use `docker compose` instead of `docker-compose`, if compose v2 plugin is installed in Docker.
-
 | __JSON RPC Client__    | __Docker compose launch command__ |
 | -------- | ------- |
 | Erigon  | `docker-compose -f erigon.yml up -d`    |