Wealthy universities’ endowments are once again in the crosshairs on Capitol Hill. Amid double-digit investment returns and growing public anxiety about student debt and the price of college, members of Congress are reviving their scrutiny of the nation’s richest colleges, an issue that largely was put on hold after the financial crisis in 2008. Earlier this week two congressional committees sent letters to several dozen colleges and universities, seeking a wide range of information about how they manage their endowments and spend endowment funds.