mark tuf-root-verify cmd hidden

Signed-off-by: Meredith Lancaster <malancas@github.com>

pkg/cmd/attestation/tufrootverify/tuf-root-verify.go

@@ -20,6 +20,7 @@ func NewTUFRootVerifyCmd(f *cmdutil.Factory) *cobra.Command {
 	var cmd = cobra.Command{
 		Use:   "tuf-root-verify --mirror <mirror-url> --root <root.json>",
 		Args:  cobra.ExactArgs(0),
+		Hidden: true,
 		Short: "Verify the TUF repository from a provided TUF root",
 		Long: heredoc.Docf(`
 			Verify a TUF repository with a local TUF root.