minor doc polish Resolves #1585
minor doc polish
Resolves #1585

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