add comments

pulsar/producer.go

@@ -153,6 +153,11 @@ type ProducerOptions struct {
 	// MaxReconnectToBroker set the maximum retry number of reconnectToBroker. (default: ultimate)
 	MaxReconnectToBroker *uint
 
+	// BatcherBuilderType sets the batch builder type (default DefaultBatchBuilder)
+	// This will be used to create batch container when batching is enabled.
+	// Options:
+	// - DefaultBatchBuilder
+	// - KeyBasedBatchBuilder
 	BatcherBuilderType
 }