RFR: JDK-8229482 : typo in release notes link

[Johan Vos]

Please review the (trivial) webrev for
https://bugs.openjdk.java.net/browse/JDK-8229482

Thanks,

- Johan

(since it is in the 12-dev repository, I want to push this to openjdk.net
first and then sync to the jfx-12 branch on github)