Wednesday, April 28, 2010 Stock Market Commentary: The major averages ended higher after the Federal Reserve held rates steady near historic lows and Spain’s debt was downgraded. Volume totals on Wednesday were reported lower compared to Tuesday’s totals which suggested large institutions were not aggressively buying stocks. Advancers led decliners by a 11-to-8 ratio on the NYSE and by a 14-to-13 ratio…