Line reference:
docker stop: Stop a running container (send SIGTERM, and then SIGKILL
after grace period) […] The main process inside the container will
receive SIGTERM, and after a grace period, SIGKILL. [emphasis mine]
docker kill: Kill a running container (send SIGKILL, or specified
signal) […] The main process inside the container will be sent
SIGKILL, or any signal specified with option –signal. [emphasis mine]
You can get more info from this post: What’s the difference between docker stop and docker kill?