Kindles have long offered a recap feature intended to act like the “Previously …” feature often seen on TV shows. It’s intended to remind you of a book’s story and characters when restarting reading after a lengthy gap. Amazon last year announced a far more sophisticated Story So Far version, and the feature is now finally rolling out to Kindles and the iPhone app in the US … Engadget reports that the number of books included are currently numbered in the thousands rather than the millions. Amazon says Story So Far will be available to US customers across “thousands” of English titles for both purchased and borrowed books. That said, you may need to update your device to get access. You can see if a summary is available by looking for the Read Recap button that pops up when you press and hold on a specific book. Alternatively, if you already have a book open, you can view a Story So Far recap simply by tapping on the three-dot menu in the top right corner.…