DOCUMENTARY PREMIERE: Part 1 of 2. This two-part, four-hour documentary has Ken Burns as its primary executive producer, and is based on the book by physician and New Yorker writer Siddhartha Mukherjee. The other name that stands out, to me, is that of its top-listed TV writer, Geoffrey C. Ward, who has been a major contributor to most of Burns’ best nonfiction miniseries, The Civil War included. (By the way? Want to feel old? This fall, PBS’s The C