code: func (ps *peerSet) Reset() {
  	ps.lock.RLock()
  	defer ps.lock.RUnlock()
  
  	for _, peer := range ps.peers {
  		peer.Reset()
  	}
  }
docs: // Reset iterates over the current peer set, and resets each of the known peers
  // to prepare for a next batch of block retrieval.