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

[jddarcy]

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.

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Progress

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Issue

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

Reviewers

• Iris Clark (@irisclark - Reviewer) ⚠️ Review applies to 98977554
• Jonathan Gibbons (@jonathan-gibbons - Reviewer) ⚠️ Review applies to 98977554

Reviewing

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[openjdk]

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[mlbridge]

Webrevs

• 01: Full - Incremental (6df77a29)
• 00: Full (98977554)

[openjdk]

@jddarcy This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8284966: Update SourceVersion.RELEASE_19 description for language changes

Reviewed-by: iris, jjg

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[jonathan-gibbons]

LGTM

[jddarcy]

/integrate

[openjdk]

Going to push as commit 0b8dd4a.

[openjdk]

@jddarcy Pushed as commit 0b8dd4a.

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