RFR: 8368953: Document the reason why Serial/Parallel/G1 use zero as dirty card value

[Ivan Walulya]

On Tue, 30 Sep 2025 11:43:10 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   please review this trivial change to document the reason for the dirty/clean card value selection.
> 
> Testing: local compilation
> 
> Thanks,
>   Thomas

Marked as reviewed by iwalulya (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27575#pullrequestreview-3284374275