volume.balance: default to balance ALL_COLLECTIONS

weed/shell/command_volume_balance.go

@@ -64,7 +64,7 @@ func (c *commandVolumeBalance) Help() string {
 func (c *commandVolumeBalance) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
 
 	balanceCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
-	collection := balanceCommand.String("collection", "EACH_COLLECTION", "collection name, or use \"ALL_COLLECTIONS\" across collections, \"EACH_COLLECTION\" for each collection")
+	collection := balanceCommand.String("collection", "ALL_COLLECTIONS", "collection name, or use \"ALL_COLLECTIONS\" across collections, \"EACH_COLLECTION\" for each collection")
 	dc := balanceCommand.String("dataCenter", "", "only apply the balancing for this dataCenter")
 	applyBalancing := balanceCommand.Bool("force", false, "apply the balancing plan.")
 	if err = balanceCommand.Parse(args); err != nil {