GLOBAL MARKETS-Support for U.S. Syria action limits stocks' rise

* U.S. stocks trim gains; Microsoft slumps after Nokia deal * Treasury bond selling resumes * U.S. manufacturing sector expands * U.S. dollar hits six-week high By Caroline Valetkevitch NEW YORK, Sept 3 (Reuters) - World stock markets were up slightly on Tuesday but cut gains after U.S. congressional leaders voiced support for military intervention in Syria, while bond yields rose and the dollar gained on strong U.S. manufacturing data. Data showing U.S. manufacturing h