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

[Kevin Rushforth]

On Sat, 16 Sep 2023 09:16:02 GMT, Jeanette Winzenburg <fastegal at openjdk.org> wrote:

>> 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?

Well how embarrassing! Thanks for pointing out the typo that none of the rest of us saw. In addition to fixing the release notes, I'll update the Risk and Solution sections of the CSR, which is where the typo originated (the Specification section of the CSR has it right).

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PR Review Comment: https://git.openjdk.org/jfx/pull/1239#discussion_r1327962489