RFR: JDK-8309554: Update descriptions in SourceVersion

[Roger Riggs]

On Tue, 6 Jun 2023 17:46:37 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> Update SourceVersion to user terminology under consideration for the related ClassFileFormatVersion enum, changing "recognized by" to "introduced by".

Marked as reviewed by rriggs (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/14340#pullrequestreview-1465805599