function help( settings ) {
	var HELP_TEXT;
	var name;
	var o;
	var i;

	HELP_TEXT = '\n';
	for ( i = 0; i < SETTINGS_NAMES.length; i++ ) {
		name = SETTINGS_NAMES[ i ];
		o = SETTINGS[ name ];
		HELP_TEXT += name + '\n';
		HELP_TEXT += '    ';
		HELP_TEXT += o.desc; // TODO: auto-wrap description
		HELP_TEXT += format( ' Value: %s.', settings[ name ] );
		HELP_TEXT += '\n\n';
	}
	return HELP_TEXT;
}
Returns settings help text.

@private
@param {Object} settings - REPL settings
@returns {string} settings help text