cmd/authorize: show required arguments in help text

cmd/authorize/authorize.go

@@ -23,19 +23,23 @@ func init() {
 }
 
 var commandDefinition = &cobra.Command{
-	Use:   "authorize",
+	Use:   "authorize <fs name> [base64_json_blob | client_id client_secret]",
 	Short: `Remote authorization.`,
 	Long: `Remote authorization. Used to authorize a remote or headless
 rclone from a machine with a browser - use as instructed by
 rclone config.
 
+The command requires 1-3 arguments:
+  - fs name (e.g., "drive", "s3", etc.)
+  - Either a base64 encoded JSON blob obtained from a previous rclone config session
+  - Or a client_id and client_secret pair obtained from the remote service
+
 Use --auth-no-open-browser to prevent rclone to open auth
 link in default browser automatically.
 
 Use --template to generate HTML output via a custom Go template. If a blank string is provided as an argument to this flag, the default template is used.`,
 	Annotations: map[string]string{
 		"versionIntroduced": "v1.27",
-		// "groups":            "",
 	},
 	RunE: func(command *cobra.Command, args []string) error {
 		cmd.CheckArgs(1, 3, command, args)