Can i contribute for flink doc ?

[Camile Sing]

Hi, all
    I'm a Flink user. recently I find some problems when I use Flink, it
takes some time to understand the internal mechanisms. This really makes me
know more about Flink, but I think the doc can be clearer, so I open some
merge requests for the doc:
- https://github.com/apache/flink/pull/16823
- https://github.com/apache/flink/pull/16683

but I don't know why nobody merges it and no comment.