[FAB-6902]FAB-6903 update fabcar doc to stick with code
[FAB-6902]FAB-6903 update fabcar doc to stick with code

This sub-task updated the fabcar docs in WYFA. 
make it consistent with the most recent sample source code

Change-Id: I9014ebc635f792a6a15f4cf9982bc771627ceb70
Signed-off-by: Min Luo <faea94506f0aefda4fa23cf042c57b69e3ff05d6@hotmail.com>

ckeyer/fabric,binhn/fabric,manish-sethi/fabric-sidedb,xixuejia/fabric,manish-sethi/fabric-sidedb,lukehuangch/fabric,lukehuangch/fabric,lukehuangch/fabric,stemlending/fabric,stemlending/fabric,lukehuangch/fabric,ckeyer/fabric,lukehuangch/fabric,manish-sethi/fabric-sidedb,muralisrini/fabric,jimthematrix/fabric,ckeyer/fabric,muralisrini/fabric,hyperledger/fabric,ckeyer/fabric,muralisrini/fabric,binhn/fabric,manish-sethi/fabric,xixuejia/fabric,manish-sethi/fabric-sidedb,ckeyer/fabric,manish-sethi/fabric-sidedb,ckeyer/fabric,stemlending/fabric,manish-sethi/fabric-sidedb,lukehuangch/fabric,ckeyer/fabric,lukehuangch/fabric,stemlending/fabric,hyperledger/fabric,binhn/fabric,jimthematrix/fabric,manish-sethi/fabric-sidedb,xixuejia/fabric,manish-sethi/fabric