code: func NewBlockDisconnected(headerDisconnected wire.BlockHeader,
  	heightDisconnected uint32, chainTip wire.BlockHeader) *Disconnected {
  
  	return &Disconnected{
  		headerDisconnected: headerDisconnected,
  		heightDisconnected: heightDisconnected,
  		chainTip:           chainTip,
  	}
  }
docs: // NewBlockDisconnected creates a Disconnected notification for the given block.