Add a note explaining channel name restrictions on test network tutorial
Add a note explaining channel name restrictions on test network tutorial

Signed-off-by: ibrahima diallo <77f161ac41e6cef600e6f90d89c0f67701c4bf70@gmail.com>

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