Remove -h flag from completion and daemon reference

All docker subcommands support `-h` as an alias for `--help`
unless they have `-h` aliased to something else like `docker run`,
which uses `-h` for `--hostname`.

`-h` is not included in the help messages of the commands, though.

It ist visible in
* reference: only in `docker daemon` reference,
  see output of `grep -Rse --help=false docs`
* man pages: only in `docker` man page
  see output of `grep -RF '**-h**' man`

For consistency reasons, this commit removes `-h` as an alias for
`--help` from the reference page, man page and the bash completion.

Signed-off-by: Harald Albers <github@albersweb.de>

docs/reference/commandline/daemon.md

@@ -32,7 +32,7 @@ parent = "smn_cli"
       -G, --group="docker"                   Group for the unix socket
       -g, --graph="/var/lib/docker"          Root of the Docker runtime
       -H, --host=[]                          Daemon socket(s) to connect to
-      -h, --help=false                       Print usage
+      --help=false                           Print usage
       --icc=true                             Enable inter-container communication
       --insecure-registry=[]                 Enable insecure registry communication
       --ip=0.0.0.0                           Default IP when binding container ports