RFR: 8316135: Create release notes for JavaFX 21 [v2]

[Kevin Rushforth]

On Wed, 13 Sep 2023 00:10:14 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

>> Kevin Rushforth has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Add missing bugs JDK-8305885 and JDK-8304290
>
> doc-files/release-notes-21.md line 139:
> 
>> 137: [JDK-8299977](https://bugs.openjdk.org/browse/JDK-8299977)|Update WebKit to 615.1|web
>> 138: [JDK-8301009](https://bugs.openjdk.org/browse/JDK-8301009)|Update libxml2 to 2.10.3|web
>> 139: [JDK-8306115](https://bugs.openjdk.org/browse/JDK-8306115)|Update libxml2 to 2.10.4|web
> 
> Do we really need the upgrade to 2.10.3 in the release notes if the release includes 2.10.4?

Hmm. Good point. Using somewhat similar reasoning as to why we exclude bugs introduced and fixed in the same release, we can exclude a fix that was added and then superseded in the same release. I'll remove it.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1239#discussion_r1324402581