code: func (n *Network) peerUserCryptoDir(p *Peer, user, cryptoMaterialType string) string {
  	org := n.Organization(p.Organization)
  	Expect(org).NotTo(BeNil())
  
  	return n.userCryptoDir(org, "peerOrganizations", user, cryptoMaterialType)
  }
docs: // peerUserCryptoDir returns the path to the directory containing the
  // certificates and keys for the specified user of the peer.