"knownledge" spelling error in final paragraph of Question general feedback Help file:
Question general feedback
Question general feedback is some text that gets shown to the student after they have attempted the question. Unlike feedback, which depends on the question type and what response the student gave, the same general feedback text is shown to all students.
You can control when general feedback is shown to students using the "Students may review:" check-boxes on the quiz editing form.
You can use the general feedback to give students some background to what knownledge the question was testing. Or to give them a link to more information they can use if they did not understand the questions.