BRUSSELS (Reuters) - Euro zone economic sentiment fell less than expected in October, data showed on Tuesday, thanks to small improvements in optimism among consumers and in the retail sector, which helped limit the downward pull from industry, services and construction. The European Commission's monthly business and consumer survey showed the economic sentiment indicator for the 17 countries using the euro fell to 84.5 points this month from a revised 85.2 points in September. Economists polled by Reuters had expected a decline to 84.0 points from the previously reported 85 points. ...