TREASURIES-U.S. yields fall on euro's rise, stock losses

* European yields fall as euro hits near two-year peak vs dollar * Wall Street's decline stoke safe-haven bids for bonds * U.S. one-month rate volatility at record low -BAML data * October T-bill rates jump on worries about debt ceiling (Updates market action, adds quote) By Richard Leong NEW YORK, July 21 (Reuters) - U.S. Treasury yields fell on Friday, with benchmark yields hitting three-week lows, as the euro reached a near two-year high against dollar, raising doubt