Orderer port number in docker-compose.yaml

The orderer section in docker-compose.yaml does not have expected port number (7050) mentioned
(https://hyperledger-fabric-ca.readthedocs.io/en/latest/docker_compose.html)

orderer1-org0:
container_name: orderer1-org0
image: hyperledger/fabric-orderer:1.4.0
environment:
- ORDERER_HOME=/tmp/hyperledger/orderer
- ORDERER_HOST=orderer1-org0
- ORDERER_GENERAL_LISTENADDRESS=0.0.0.0
- ORDERER_GENERAL_GENESISMETHOD=file
- ORDERER_GENERAL_GENESISFILE=/tmp/hyperledger/org0/orderer/genesis.block
- ORDERER_GENERAL_LOCALMSPID=org0MSP
- ORDERER_GENERAL_LOCALMSPDIR=/tmp/hyperledger/org0/orderer/msp
- ORDERER_GENERAL_TLS_ENABLED=true
- ORDERER_GENERAL_TLS_CERTIFICATE=/tmp/hyperledger/org0/orderer/tls-msp/signcerts/cert.pem
- ORDERER_GENERAL_TLS_PRIVATEKEY=/tmp/hyperledger/org0/orderer/tls-msp/keystore/key.pem
- ORDERER_GENERAL_TLS_ROOTCAS=[/tmp/hyperledger/org0/orderer/tls-msp/tlscacerts/tls-0-0-0-0-7052.pem]
- ORDERER_GENERAL_LOGLEVEL=debug
- ORDERER_DEBUG_BROADCASTTRACEDIR=data/logs
volumes:
- /tmp/hyperledger/org0/orderer:/tmp/hyperledger/org0/orderer/
networks:
- fabric-ca