RFR: 8316135: Create release notes for JavaFX 21 [v3]

[Jeanette Winzenburg]

On Wed, 13 Sep 2023 12:06:44 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:
> 
>   Review feedback: remove libxml2 2.10.3

doc-files/release-notes-21.md line 46:

> 44: A compilation error will occur in one of the following two unlikely cases:
> 45: 
> 46: * An application class extends `Menu`, `MenuItem`, `TreeColumnBase`, or `TreeItem`, and overrides `addEventHandler` or `removeEventHandler`

hmm .. did I miss a new class (TreeColumnBase), or shouldn't that be TableColumnBase?

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PR Review Comment: https://git.openjdk.org/jfx/pull/1239#discussion_r1327936721