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

[Jeanette Winzenburg]

On Mon, 18 Jan 2021 15:07:34 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

> The usual doc fixes (for OpenJFX 16).
> 
> Can wait until RDP2 to see if something else comes up.

wondering how small a doc error is small enough to go into this: just noticed that Skinnable talks about "Control" in all of its methods - should be "Skinnable" everywhere (except as example implementation in overview doc), IMO. But then, the overview doc is .. lame as well, so might need its own bug anyway?

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