Update READMEs for producer performance tool

tools/README.md

@@ -6,6 +6,6 @@ Some of these tools mirror tools that ship with Kafka, but these tools won't req
 - [kafka-console-producer](./kafka-console-producer): a command line tool to produce a single message to your Kafka custer.
 - [kafka-console-partitionconsumer](./kafka-console-partitionconsumer): (deprecated) a command line tool to consume a single partition of a topic on your Kafka cluster.
 - [kafka-console-consumer](./kafka-console-consumer): a command line tool to consume arbitrary partitions of a topic on your Kafka cluster.
-- [kafka-producer-performance](./kafka-producer-performance): a command line tool to performance test production on your Kafka cluster.
+- [kafka-producer-performance](./kafka-producer-performance): a command line tool to performance test producers (sync and async) on your Kafka cluster.
 
 To install all tools, run `go get github.com/Shopify/sarama/tools/...`

tools/kafka-producer-performance/README.md

@@ -10,7 +10,7 @@ A command line tool to test producer performance.
 ### Usage
 
     # Display all command line options
-    kafka-console-producer -help
+    kafka-producer-performance -help
 	
 	# Minimum invocation
     kafka-producer-performance \