swarm leave is not only for workers

the "docker swarm leave" command description
mentioned that the command can only be used
for workers, however, the command can also
be used for managers (using the `-f` / `--force`
option).

this patch removes the "(workers only)" part
of the command description.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

command/swarm/leave.go

@@ -19,7 +19,7 @@ func newLeaveCommand(dockerCli *command.DockerCli) *cobra.Command {
 
 	cmd := &cobra.Command{
 		Use:   "leave [OPTIONS]",
-		Short: "Leave the swarm (workers only)",
+		Short: "Leave the swarm",
 		Args:  cli.NoArgs,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			return runLeave(dockerCli, opts)