Update some outdated information in environment setup guide
Update some outdated information in environment setup guide

Akasalabs/Plilot1,cbagade/healthcare_chain_code,twitsakthi/learn-chaincode,mshingote/learn-chaincode,adilharis2001/learn-chaincode,Earlvik/learn-chaincode,aakaakar/ranjan_chaincode7,JonathanGonczoroski/learn-chaincode,cweiers/learn-chaincode,shivam3192/learn-chaincode,Akasalabs/Plilot1,abhishekibm/learn-chaincode,Earlvik/learn-chaincode,aakaakar/learn-chaincode,haribalaji79/learn-chaincode,Earlvik/learn-chaincode