RFR: JDK-8308388: Update description of SourceVersion.RELEASE_21 [v2]

Thu May 18 22:21:49 UTC 2023

On Thu, 18 May 2023 21:07:16 GMT, Joe Darcy <darcy at openjdk.org> wrote:

>> Update description of SourceVersion.RELEASE_21 for the new language features (once they are pushed).
>
> Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Respond to review feedback.

Marked as reviewed by iris (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/14051#pullrequestreview-1433528866