docs: add minimum versions to the command pages

cmd/tree/tree.go

@@ -95,6 +95,9 @@ short options as they conflict with rclone's short options.
 For a more interactive navigation of the remote see the
 [ncdu](/commands/rclone_ncdu/) command.
 `,
+	Annotations: map[string]string{
+		"versionIntroduced": "v1.38",
+	},
 	RunE: func(command *cobra.Command, args []string) error {
 		cmd.CheckArgs(1, 1, command, args)
 		fsrc := cmd.NewFsSrc(args)