"shutdown --help" does not declare that '--timeout' is only relevant to standalone servers

In standalone mode, shutdown can be used with a timeout in order to execute a graceful shutdown of the server.
In domain mode, this attribute is not used and it is not taken into account when the domain is shutting down.

The CLI output of shutdown -help does not declare that -timeout is only relevant to standalone servers and is it not allowed if -host is used. The handler should reject that combo.