[jfx19] RFR: 8290393: Code sample in javadoc of ObservableValue flatMap is incorrect

[Nir Lisker]

On Sat, 16 Jul 2022 13:24:22 GMT, John Hendrikx <jhendrikx at openjdk.org> wrote:

> Fix small error in flatmap docs

If we bump to Java 18 we would be able to use [JEP 413: Code Snippets in Java API Documentation](https://openjdk.org/jeps/413) and avoid these errors :)

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PR: https://git.openjdk.org/jfx/pull/831