Disappointing news on consumer spending and income helped nudge markets lower, quietly ending their worst month in more than a year. An added uncertainty is Syria and what the United States will eventually do. Early in Friday’s session, the Commerce Department said Americans’ income and spending barely rose in July. The scant rise suggests economic growth is off to a weak start for the second half of the year. It followed other reports showing drops in new-home sales and orders for durable goods in July. Salesforce.com jumped to a record high after the company reported a strong quarter and raised its sales forecast.