RFR: 8316135: Create release notes for JavaFX 21 [v2]

[Abhinay Agarwal]

On Tue, 12 Sep 2023 22:23:51 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Note that we need to use the base bug ID for backports that were first fixed in jfx21

Can you shed some light on this for future reference?

In case of [JDK-8313324](https://bugs.openjdk.org/browse/JDK-8313324), we do not use the base bug id. The same was also applied to jfx21.0.1, should we be using [JDK-8313331](https://bugs.openjdk.org/browse/JDK-8313331) or the base bug id for 21.0.1 release notes?

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PR Review Comment: https://git.openjdk.org/jfx/pull/1239#discussion_r1324063257