[jfx20] RFR: 8304359: Create release notes for JavaFX 20 [v2]

[Nir Lisker]

On Thu, 16 Mar 2023 17:14:28 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Release notes for JavaFX 20, including one important change to note (the requirement of JDK 17 as the minimum needed to run JavaFX 20) and the list of enhancements and bugs fixed in this release.
>> 
>> Note: This PR is targeted to `jfx20`.
>
> Kevin Rushforth has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add missing FXMLLoader note

Isn't https://bugs.openjdk.org/browse/JDK-8298728 a bug and not an enhancement?

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PR: https://git.openjdk.org/jfx/pull/1060