RFR: 8353218: Shenandoah: Out of date comment references Brooks pointers

[Kelvin Nilsen]

On Fri, 28 Mar 2025 23:33:48 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Trivial change, comment only.

Marked as reviewed by kdnilsen (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/24304#pullrequestreview-2727087168