remove "experimental" hint from help / usage output

This was added in 02c2073, which changed
the buildx CLI to match the behavior of the docker CLI, which conditionally
hid some options that were marked experimental. The CLI now shows has
client-side experimental options enabled by default (but labeled as
experimental where suitable).

Before this patch, every command would print this message unless experimental
was enabled;

    docker buildx --help
    ...
    Run 'docker buildx COMMAND --help' for more information on a command.

    Experimental commands and flags are hidden. Set BUILDX_EXPERIMENTAL=1 to show them.

With this patch applied, that message is no longer shown.

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

Author: thaJeztah

commands/root.go

@@ -84,10 +84,6 @@ func NewRootCmd(name string, isPlugin bool, dockerCli *command.DockerCli) *cobra
 		"using default config store",
 	))
 
-	if !confutil.IsExperimental() {
-		cmd.SetHelpTemplate(cmd.HelpTemplate() + "\nExperimental commands and flags are hidden. Set BUILDX_EXPERIMENTAL=1 to show them.\n")
-	}
-
 	addCommands(cmd, &opt, dockerCli)
 	return cmd
 }