docs(stop): say --timeout 0 is immediate SIGKILL

[locker95]

the options table shows --timeout defaulting to 0, which reads like stop just kills the container. omitting the flag still uses the container --stop-timeout or the daemon default; --timeout 0 is the immediate SIGKILL.

same note on restart.

[thaJeztah]

the options table shows --timeout defaulting to 0,

We should probably look at fixing that; the --help output does not show a default; and looks like the documentation on docs.docker.com does print it correctly;

Compared to the generated docs on GitHub;