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

[Abhinay Agarwal]

On Wed, 13 Sep 2023 12:04:28 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> We should _always_ use the base bug ID and _never_ the backport ID, which for this bug is [JDK-8313227](https://bugs.openjdk.org/browse/JDK-8313227).
>> 
>> I will look into adjusting the JBS filter to make this a less error-prone process (using the `masterbug` macro which will provide the base bug IDs for a given set of backports).
>
>> We should always use the base bug ID and never the backport ID, which for this bug is [JDK-8313227](https://bugs.openjdk.org/browse/JDK-8313227).
> 
> And to be clear I meant that the "base bug ID" for this bug is [JDK-8313227](https://bugs.openjdk.org/browse/JDK-8313227).

my bad, the release notes has the correct base bug id 👍 

my local jfx21 release notes skipped [JDK-8313227](https://bugs.openjdk.org/browse/JDK-8313227) as it was labelled as `hgupdate-sync`.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1239#discussion_r1324428532