It’s common practice for U.S. secretaries of education to come from a background, in, well, education. That includes Betsy DeVos, President Donald Trump’s previous, headline-grabbing education secretary, who had a well-documented record when it came to schools.But Trump’s current nominee for that position, Linda McMahon, bucks the trend. McMahon has a limited background in education, and a long career as a business executive.She led World Wrestl…