Update docs to use the new docker daemon command

Signed-off-by: Tibor Vass <tibor@docker.com>
Upstream-commit: e246f1e4eec3290f343627e73a926b940b77b121
Component: engine

components/engine/docs/reference/commandline/cli.md

@@ -19,6 +19,9 @@ or execute `docker help`:
 
     $ docker
       Usage: docker [OPTIONS] COMMAND [arg...]
+             docker daemon [ --help | ... ]
+             docker [ -h | --help | -v | --version ]
+
         -H, --host=[]: The socket(s) to bind to in daemon mode, specified using one or more tcp://host:port, unix:///path/to/socket, fd://* or fd://socketfd.
 
       A self-sufficient runtime for Linux containers.