RFR: JDK-8284966: Update SourceVersion.RELEASE_19 description for language changes

Fri May 20 03:35:40 UTC 2022

On Thu, 19 May 2022 17:56:34 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> Updating the description of RELEASE_19 for the anticipated language changes in Java SE 19. I'll defer pushing until the proposed-to-target record patterns compiler changes are pushed. Also adding links to the JSR 269 API in the package info files.

Marked as reviewed by iris (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/8793