code: func (s Strings) Addrs(defaultPort int) ([]NetAddr, error) {
  	addrs := make([]NetAddr, len(s))
  	for i, val := range s {
  		addr, err := ParseHostPortAddr(val, defaultPort)
  		if err != nil {
  			return nil, trace.Wrap(err)
  		}
  		addrs[i] = *addr
  	}
  	return addrs, nil
  }
docs: // Addrs returns strings list converted to address list