RFR: 8368681: Shenandoah: Add documentation comments for ShenandoahAllocationRate [v2]

[Xiaolong Peng]

On Sat, 27 Sep 2025 23:13:34 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

>> Add documentation to ShenandoahAllocationRate
>
> Kelvin Nilsen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix several typos

Looks good to me, thanks!

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Marked as reviewed by xpeng (Committer).

PR Review: https://git.openjdk.org/jdk/pull/27505#pullrequestreview-3296939226