code: func (n *Network) PeerCert(p *Peer) string {
  	org := n.Organization(p.Organization)
  	Expect(org).NotTo(BeNil())
  
  	return filepath.Join(
  		n.PeerLocalMSPDir(p),
  		"signcerts",
  		fmt.Sprintf("%s.%s-cert.pem", p.Name, org.Domain),
  	)
  }
docs: // PeerCert returns the path to the peer's certificate.