add a reference to multiple -H options, and update the other example of -H option

and copy changes to the cli.md file

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)

docker/docker.go

@@ -67,7 +67,7 @@ func main() {
 	)
 	flag.Var(&flDns, []string{"#dns", "-dns"}, "Force docker to use specific DNS servers")
 	flag.Var(&flDnsSearch, []string{"-dns-search"}, "Force Docker to use specific DNS search domains")
-	flag.Var(&flHosts, []string{"H", "-host"}, "The socket to bind to in daemon mode, specified using tcp://host:port, unix:///path/to/socket, fd://* or fd://socketfd.")
+	flag.Var(&flHosts, []string{"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.")
 
 	flag.Parse()
 

docs/sources/reference/commandline/cli.md

@@ -9,7 +9,7 @@ no parameters or execute `docker help`:
 
     $ sudo docker
       Usage: docker [OPTIONS] COMMAND [arg...]
-        -H=[unix:///var/run/docker.sock]: tcp://[host]:port to bind/connect to or unix://[/path/to/socket] to use. When host=[127.0.0.1] is omitted for tcp or path=[/var/run/docker.sock] is omitted for unix sockets, default values are used.
+        -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.
 
@@ -53,7 +53,7 @@ expect an integer, and they can only be specified once.
 
     Usage of docker:
       -D, --debug=false: Enable debug mode
-      -H, --host=[]: Multiple tcp://host:port or unix://path/to/socket to bind in daemon mode, single connection otherwise. systemd socket activation can be used with fd://[socketfd].
+      -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.
       -G, --group="docker": Group to assign the unix socket specified by -H when running in daemon mode; use '' (the empty string) to disable setting of a group
       --api-enable-cors=false: Enable CORS headers in the remote API
       -b, --bridge="": Attach containers to a pre-existing network bridge; use 'none' to disable container networking
@@ -78,6 +78,8 @@ expect an integer, and they can only be specified once.
       --tlsverify=false: Use TLS and verify the remote (daemon: verify client, client: verify daemon)
       --mtu=0: Set the containers network MTU; if no value is provided: default to the default route MTU or 1500 if no default route is available
 
+    Options with [] may be specified multiple times.
+
 The Docker daemon is the persistent process that manages containers.
 Docker uses the same binary for both the daemon and client. To run the
 daemon you provide the `-d` flag.

docs/sources/reference/commandline/cli.rst

@@ -12,7 +12,7 @@ To list available commands, either run ``docker`` with no parameters or execute
 
   $ sudo docker
     Usage: docker [OPTIONS] COMMAND [arg...]
-      -H=[unix:///var/run/docker.sock]: tcp://[host]:port to bind/connect to or unix://[/path/to/socket] to use. When host=[127.0.0.1] is omitted for tcp or path=[/var/run/docker.sock] is omitted for unix sockets, default values are used.
+      -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.
 
@@ -63,10 +63,10 @@ only be specified once.
 
 ::
 
-    Usage:
+    Usage of docker:
       -D, --debug=false: Enable debug mode
       -G, --group="docker": Group to assign the unix socket specified by -H when running in daemon mode; use '' (the empty string) to disable setting of a group
-      -H, --host=[]: The socket to bind to in daemon mode, specified using tcp://host:port, unix:///path/to/socket, fd://* or fd://socketfd.
+      -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.
       --api-enable-cors=false: Enable CORS headers in the remote API
       -b, --bridge="": Attach containers to a pre-existing network bridge; use 'none' to disable container networking
       -bip="": Use this CIDR notation address for the network bridge's IP, not compatible with -b