fix typo

Signed-off-by: sh2 <[email protected]>

cmd/gtctl/cluster_connect.go

@@ -59,7 +59,7 @@ func NewConnectCommand(l logger.Logger) *cobra.Command {
 			case "pg", "psql", "postgres":
 				protocol = opt.Postgres
 			default:
-				return fmt.Errorf("unsupport connection protocol: %s", options.Protocol)
+				return fmt.Errorf("unsupported connection protocol: %s", options.Protocol)
 			}
 			connectOptions := &opt.ConnectOptions{
 				Namespace: options.Namespace,