RFR: 8290844: Add Skin.install() method [v9]

[Andy Goryachev]

On Tue, 4 Oct 2022 19:08:23 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> Good point. We have a tension between "pure OO" and giving clear advice. In the case of `Skin`, there are only two direct subclasses, so we could call that out here and say that `Control` enforces a 1-to-1 relationship, but `PopupControl` does not. Alternatively, we could change this to say that "Some implementations of Skinnable define a 1-to-1 relationship...". That would key developers to look for that in the the documentation of the implementing class.
>> 
>> Which way do you think is best?
>
> I like "Some implementations of Skinnable define a 1-to-1 relationship..."...

I re-phrased the javadoc, please see if it's clearer.

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PR: https://git.openjdk.org/jfx/pull/845