Revise docs

Update kafka-clients version
Revise Kafka Streams docs

Resolves #752

docs/src/main/asciidoc/dlq.adoc

@@ -10,7 +10,7 @@ This means the Dead-Letter topic must have at least as many partitions as the or
 To change this behavior, add a `DlqPartitionFunction` implementation as a `@Bean` to the application context.
 Only one such bean can be present.
 The function is provided with the consumer group, the failed `ConsumerRecord` and the exception.
-For example, if you always with to route to partition 0, you might use:
+For example, if you always want to route to partition 0, you might use:
 
 ====
 [source, java]

docs/src/main/asciidoc/overview.adoc

@@ -40,7 +40,7 @@ The Apache Kafka Binder implementation maps each destination to an Apache Kafka
 The consumer group maps directly to the same Apache Kafka concept.
 Partitioning also maps directly to Apache Kafka partitions as well.
 
-The binder currently uses the Apache Kafka `kafka-clients` 1.0.0 jar and is designed to be used with a broker of at least that version.
+The binder currently uses the Apache Kafka `kafka-clients` version `2.3.1`.
 This client can communicate with older brokers (see the Kafka documentation), but certain features may not be available.
 For example, with versions earlier than 0.11.x.x, native headers are not supported.
 Also, 0.11.x.x does not support the `autoAddPartitions` property.