4A - ORDINANCE RELATING TO MIAMI-DADE ECONOMIC ADVOCACY TRUST; AMENDING SECTIONS 2-501, 2-503, 2-505, AND 2-506 OF THE CODE OF MIAMI-DADE COUNTY, FLORIDA; AMENDING THE PURPOSE, COMPOSITION, TENURE, ORGANIZATION, STAFF SUPPORT, REPORTING REQUIREMENTS, POWERS, AND DUTIES OF THE TRUST; PROVIDING SEVERABILITY, INCLUSION IN THE CODE, AND AN EFFECTIVE DATE