[docs] kill examples use docker-compose

[janbrasna]

Description

compose kill docs still refer to docker-compose in a few places, esp. usage examples:

Steps To Reproduce

Open https://docs.docker.com/reference/cli/docker/compose/kill/ and look for code samples.

Compose Version

compose/docs/reference/compose_kill.md

Line 7 in ea4ccf6

$ docker-compose kill -s SIGINT

Docker Environment

https://github.com/docker/docs/blob/f1fa2474a54adcd52b761917eb42aabf05dcd8f2/_vendor/github.com/docker/compose/v2/docs/reference/docker_compose_kill.yaml#L7