RFR: 8310999: Add @since info in jdk.jsobject files [v2]

[Roger Riggs]

On Wed, 5 Jul 2023 16:05:25 GMT, Phil Race <prr at openjdk.org> wrote:

> unless my eyes deceive me the suppresswarnings is still present.

Gack!, I removed it and then put it back to try to discover why it was there in the first place.
Gone again and thanks

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PR Comment: https://git.openjdk.org/jdk/pull/14775#issuecomment-1622080242