RFR: 8316135: Create release notes for JavaFX 21

[Andy Goryachev]

On Tue, 12 Sep 2023 17:14:28 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Release notes for JavaFX 21, including four important changes, and the list of enhancements and bugs fixed in this release.
> 
> I plan to integrate this on Monday, Sep 18th, and backport it to `jfx21` in time for Tuesday's release of JavaFX 21.

doc-files/release-notes-21.md line 13:

> 11: ### JavaFX Requires macOS 11 or Later
> 12: 
> 13: On Mac platforms, JavaFX 21 requires macOS 11 or later. An exception will be thrown when initializing the JavaFX runtime on older versions of macOS.

just curious: all these lists (CSRs, Enhancements, Bug Fixes) are compiled from JBS, correct?

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PR Review Comment: https://git.openjdk.org/jfx/pull/1239#discussion_r1323352233