add comments on docker kill vs stop

Author: Xronophobe

chapter_09_docker.asciidoc

@@ -857,6 +857,16 @@ WARNING: Make sure you use the `-it` flags to the Docker `run`
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 If you've got a container that's "hanging" in a terminal window,
 you can kill it from another one.
+// CSANAD:  `docker stop` would trigger a graceful SIGTERM, `docker kill` sends a SIGKILL.
+//          SIGKILL would terminate the container even when SIGTERM cannot, but it could
+// also result in broken DB, leave the port "in use" or other side effects. I would prefer
+// using `docker stop` over `kill` and mention `kill` in case the container is still stuck.
+//
+// However, if we leave it with just `docker kill`, then maybe we should mention these
+// possible side effects and also the title should reflect it like:
+// "How to Forcefully Stop a Docker Container" (since "How to Kill a Container" may sound a bit
+// harsh...
+
 
 The docker daemon lets you list all the currently running containers
 with `docker ps`: