RFR: 8316135: Create release notes for JavaFX 21 [v4]

[Nir Lisker]

On Sat, 16 Sep 2023 13:48:17 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.
>
> Kevin Rushforth has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix typo: TreeColumnBase --> TableColumnBase

doc-files/release-notes-21.md line 72:

> 70: [JDK-8307363](https://bugs.openjdk.org/browse/JDK-8307363)|TextFlow.underlineShape()|graphics
> 71: [JDK-8299756](https://bugs.openjdk.org/browse/JDK-8299756)|Minor updates in CSS Reference|other
> 72: [JDK-8306648](https://bugs.openjdk.org/browse/JDK-8306648)|Update the JavaDocs to show the NEW section and DEPRECATED versions|other

Should we mention somewhere that this doesn't always work properly because of [JDK-8309765](https://bugs.openjdk.org/browse/JDK-8309765)?

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PR Review Comment: https://git.openjdk.org/jfx/pull/1239#discussion_r1327964863