Caroline Framke Chief TV CriticAs the 20th anniversary of 9/11 fast approaches, you’ll have no shortage of options should you want — for whatever reason —to watch a documentary about it. As a mere sampling: there’s “One Day in America” from National Geographic, “Generation 9/11” from PBS, “9/11: Inside the President’s War Room” from Apple TV Plus, and an entire day’s worth of programming on the History Channel.