More readable peers usage:

other master nodes in comma separated ip:port list, example:
127.0.0.1:9333,127.0.0.1:9334

Add example to prompt ip:port list is split by ','

go/weed/master.go

@@ -32,7 +32,7 @@ var (
 	masterIp                = cmdMaster.Flag.String("ip", "localhost", "master <ip>|<server> address")
 	masterBindIp            = cmdMaster.Flag.String("ip.bind", "0.0.0.0", "ip address to bind to")
 	metaFolder              = cmdMaster.Flag.String("mdir", os.TempDir(), "data directory to store meta data")
-	masterPeers             = cmdMaster.Flag.String("peers", "", "other master nodes in comma separated ip:port list")
+	masterPeers             = cmdMaster.Flag.String("peers", "", "other master nodes in comma separated ip:port list, example: 127.0.0.1:9093,127.0.0.1:9094")
 	volumeSizeLimitMB       = cmdMaster.Flag.Uint("volumeSizeLimitMB", 30*1000, "Master stops directing writes to oversized volumes.")
 	mpulse                  = cmdMaster.Flag.Int("pulseSeconds", 5, "number of seconds between heartbeats")
 	confFile                = cmdMaster.Flag.String("conf", "/etc/weedfs/weedfs.conf", "Deprecating! xml configuration file")