[jfx16] RFR: 8252389: Fix mistakes in FX API docs

[Jeanette Winzenburg]

On Mon, 18 Jan 2021 16:13:58 GMT, Jeanette Winzenburg <fastegal at openjdk.org> wrote:

> 
> 
> thanks, that's about the lines of my thoughts as well :) Will file a separate doc bug for skinnable cleanup

fyi: just filed https://bugs.openjdk.java.net/browse/JDK-8260364

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PR: https://git.openjdk.java.net/jfx/pull/380