(Bloomberg) — State Street Global Advisors is cutting fees on three corporate bond exchange-traded funds as it seeks to boost its share of the booming fixed-income ETF business.Most Read from BloombergReliving the New York Subway Map DebateChina Cash Flowed Through Congo Bank to Former President’s Cronies‘Ghost Signs’ Haunt London’s Reviving Neighborhoods‘Pension Poachers’ Are Targeting America’s Elderly VeteransThe Boston-based issuer lowered the expense ratios to 0.04% from 0.07% for its shor