[FAB-6010] fixed the wrong URL in examples/README
[FAB-6010] fixed the wrong URL in examples/README

As the FAB-6010 pointed out, there are two URL links containing "fabric/example/..." which should be "fabric/examples/..." instead. This patch fixed them. In adtion, it is confirmed that no other documentation contain the same URL error.

Change-Id: If02b9338297219ae35c8be99dbfab402eaa91a77
Signed-off-by: luomin <faea94506f0aefda4fa23cf042c57b69e3ff05d6@hotmail.com>

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