Per the thread [DISCUSS] strategy on Java versions
- Add Java 9 and Java 10 to the support matrix as NT
- Add a NOTE to Java prereqs about "use a LTS version"
For now, leave out talk about planning for timelines on LTS additions or dropping older JDK support. Once we get over the initial hurdle of prepping for Java 11 we'll hopefully have enough info to know how realistic the things talked about in the thread are and we can include a writeup.