RFR: JDK-8172312 Update docs target and image for new combined docs

[mark.reinhold at oracle.com]

2017/4/4 12:28:18 -0700, jonathan.gibbons at oracle.com:
> Don't we need the JEP to be moved from "Proposed To Target" to 
> "Targetted" before we can push?

Yep.  Coming right up ...

- Mark