Tonight’s installment in this CNN documentary series is called “Ripped from the Headlines.” I haven’t previewed it, but it’s safe to presume it will start, or at least feature a segment on, Mort Sahl, the comedian who began performing standup comedy in the early 1950s, walking onstage with a newspaper and referring to current events covered in that day’s edition. Sahl, 89, still performs his act – and many comics since his debut have borrowed his.