On https://pdos.csail.mit.edu/6.828/2017/xv6/book-rev10.pdf (Draft as of August 29, 2017):
page 25: Some margin text is cropped
page 46: At the margin "IRQ_TIMER,+code" should probably be replaced by "IRQ_TIMER+code". Also in the index (page 105) "IRQ_TIMER,, 46" should be replaced by "IRQ_TIMER, 46" (one comma less)
page 82: Some margin text is cropped