[jdk19] RFR: JDK-8289399: Update SourceVersion to use snippets

[Jonathan Gibbons]

On Tue, 28 Jun 2022 21:30:23 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> Please review this simple doc update.

Marked as reviewed by jjg (Reviewer).

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PR: https://git.openjdk.org/jdk19/pull/87