[jfx21] RFR: 8316135: Create release notes for JavaFX 21

Mon Sep 18 15:52:10 UTC 2023

On Mon, 18 Sep 2023 15:39:18 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> This is a necessary backport of the JavaFX 21 release notes to the `jfx21` branch. We will _not_ tag `jfx21` nor rebuild JavaFX 21 as a result of this commit.

@andy-goryachev-oracle Can you do a quick review of this clean backport?

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PR Comment: https://git.openjdk.org/jfx/pull/1243#issuecomment-1723778550