RFR: 8355319: Update Manpage for Compact Object Headers (Production) [v3]

[Roman Kennke]

On Tue, 3 Jun 2025 20:56:00 GMT, David Holmes <dholmes at openjdk.org> wrote:

> I still find it an uninformative piece of documentation I'm afraid. It just begs the question "why isn't this on by default now?". The fact we haven't turned it on means we are still evaluating it. The move from experimental to product just means we are increasing the scope of the evaluation.

I restored the explanatory paragraph with slightly rephrased wording, and also added a note about performance in the first part. I hope it's good now? Otherwise please suggest changes.

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PR Comment: https://git.openjdk.org/jdk/pull/25491#issuecomment-2938689671