[FAB-5195] byfn.sh help text is incorrect

The descriptions for "down" and "restart" are the same as "up".
This patch set changes the descriptions.

Change-Id: I0ee03e5d81faa4ad6a3c43354e8a44648288df90
Signed-off-by: Nao Nishijima <nao.nishijima@hal.hitachi.com>

first-network/byfn.sh

@@ -33,8 +33,8 @@ function printHelp () {
  echo " byfn.sh -h|--help (print this message)"
  echo " -m <mode> - one of 'up', 'down', 'restart' or 'generate'"
  echo " - 'up' - bring up the network with docker-compose up"
- echo " - 'down' - bring up the network with docker-compose up"
- echo " - 'restart' - bring up the network with docker-compose up"
+ echo " - 'down' - clear the network with docker-compose down"
+ echo " - 'restart' - restart the network"
  echo " - 'generate' - generate required certificates and genesis block"
  echo " -c <channel name> - channel name to use (defaults to \"mychannel\")"
  echo " -t <timeout> - CLI timeout duration in microseconds (defaults to 10000)"