Can I get a code review on my PR for KAFKA-3809? "Auto-generate documentation for topic-level configuration"

[James Cheng]

Hi Kafka devs,

Can I get a code review on my pull request for 
https://issues.apache.org/jira/browse/KAFKA-3809? 

The code has been waiting for review for about a week. I think I clicked 
everything correctly in JIRA/Github to mark it ready for review, but it’s 
possible I missed something.

Thanks!
-James