By Katanga Johnson WASHINGTON (Reuters) -The U.S. Securities and Exchange Commission (SEC) on Wednesday proposed a rule to improve the quality of disclosures it receives from large hedge funds about their investment strategies and leverage. The rule, which was proposed in conjunction with the Commodity Futures Trading Commission (CFTC), is part of a broader regulatory effort to increase transparency of private funds amid worries the industry is a growing source of systemic risk. The proposal confirmed a Reuters report on Tuesday. It would expand reporting requirements for advisers and large he…