Khosla Ventures, the Menlo Park-headquartered venture capital firm founded by billionaire Vinod Khosla, plans to raise $3 billion across three new funds, according to regulatory filings. The firm, which has a portfolio that includes Affirm, Instacart, Impossible Foods and DoorDash, is targeting $1.5 billion for its eighth venture fund, $1 billion for an opportunity fund and another $400 million