Fix missing export instruction in docs/deploy_chaincode.md
Fix missing export instruction in docs/deploy_chaincode.md

Signed-off-by: Svetoslav Blyahov <13f5a397891a8e77c17b1bd60af8a5b83a5382b3@gmail.com>

manish-sethi/fabric-sidedb,stemlending/fabric,jimthematrix/fabric,stemlending/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric,manish-sethi/fabric-sidedb,hyperledger/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,jimthematrix/fabric,manish-sethi/fabric,hyperledger/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,stemlending/fabric,stemlending/fabric