Improve wording

Fixes #237

Author: jordansissel

docs/index.asciidoc

@@ -24,7 +24,7 @@ This input will read events from a Kafka topic.
 
 This plugin uses Kafka Client 0.11.0. For broker compatibility, see the official https://cwiki.apache.org/confluence/display/KAFKA/Compatibility+Matrix[Kafka compatibility reference].
 
-If you are using a newer version of this plugin, you will want to read the https://www.elastic.co/guide/en/logstash/master/plugins-inputs-kafka.html[latest plugin version documentation]. 
+If you're using a plugin version that was released after {version}, see the https://www.elastic.co/guide/en/logstash/master/plugins-inputs-kafka.html[latest plugin documentation] for updated information about Kafka compatibility.
 
 This input supports connecting to Kafka over: