RFR: 8345324: Update comment in SourceVersion for language evolution history for changes in 24

[Iris Clark]

On Mon, 2 Dec 2024 18:46:45 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> Update source-level, in other words non-javadoc, comment to describe the actual language changes made in 24.

List of language JEPs and preview status confirmed.

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Marked as reviewed by iris (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/22495#pullrequestreview-2473655841