Revert "Update documented version of kafka-clients"
Revert "Update documented version of kafka-clients"

This reverts commit 69e377e13b7df9cf256db271522e5601c9cc618e.

garyrussell/spring-cloud-stream,garyrussell/spring-cloud-stream,spring-cloud/spring-cloud-stream,spring-cloud/spring-cloud-stream,spring-cloud/spring-cloud-stream,garyrussell/spring-cloud-stream