The widow of late comedy star John Witherspoon is putting the family estate on the market nearly 6 years after his death ... a 25,000-square-foot, two-property compound filled with historic memories -- for just $4.6 million!!! Angela Witherspoon tells TMZ ... "We’ve made so many memories here over the years. We raised our two sons in this home. Our youngest attended The Buckley School and our oldest graduated from the Magnet at Grant High School. We’ve held countless gatherings, from Christmas