message: Use wait_events_unbuffered in example
diff: @@ -39,7 +39,7 @@ fn main() {
  });
  while !window.should_close() {
  - glfw.poll_events_unbuffered(|window_id, event| {
  + glfw.wait_events_unbuffered(|window_id, event| {
  // Multiple windows may be identified by their `window_id`
  assert_eq!(window.window_id(), window_id);
  