message: fix(animationFrame.spec): spec description fix
  This test is not related to delay but the effect of unsubscribe on the resulting Subscription.
diff: @@ -25,7 +25,7 @@ describe('Scheduler.animationFrame', () => {
  sandbox.restore();
  });
  - it('should cancel animationFrame actions when delay > 0', () => {
  + it('should cancel animationFrame actions when unsubscribed', () => {
  let actionHappened = false;
  const sandbox = sinon.sandbox.create();
  const fakeTimer = sandbox.useFakeTimers();
  