code: function onSwappableSwappedDefaultAnnouncement({dragEvent, swappedElement}) {
    const sourceText = dragEvent.source.textContent.trim() || dragEvent.source.id || 'swappable element';
    const overText = swappedElement.textContent.trim() || swappedElement.id || 'swappable element';
  
    return `Swapped ${sourceText} with ${overText}`;
  }
docs: Returns an announcement message when the Draggable element is swapped with another draggable element
  @param {SwappableSwappedEvent} swappableEvent
  @return {String}