RFR: 8324797: Code example in JavaDoc of ObservableValue#when doesn't compile

[John Hendrikx]

On Wed, 10 Jan 2024 02:36:32 GMT, Philippe Altherr <duke at openjdk.org> wrote:

> 8324797: Code example in JavaDoc of ObservableValue#when doesn't compile

I don't mind the change, but there is nothing wrong with it as far as I can see.  `ObservableValue` is used for the types as we're documenting `ObservableValue`.

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PR Comment: https://git.openjdk.org/jfx/pull/1325#issuecomment-1912979169