src/vs/workbench/contrib/userDataSync/browser/userDataSync.ts/UserDataSyncWorkbenchContribution/askForConfirmation
class UserDataSyncWorkbenchContribution:	private async askForConfirmation(): Promise<boolean> {
		const result = await this.dialogService.show(
			Severity.Info,
			localize('sync preview message', "Synchronizing your settings is a preview feature, please read the documentation before turning it on."),
			[
				localize('turn on', "Turn On"),
				localize('open doc', "Open Documentation"),
				localize('cancel', "Cancel"),
			],
			{
				cancelId: 2
			}
		);
		switch (result.choice) {
			case 1: this.openerService.open(URI.parse('https://aka.ms/vscode-settings-sync-help')); return false;
			case 2: return false;
		}
		return true;
	}