RFR: 8351374: Improve comment about queue.remove timeout in CleanerImpl.run

[Brent Christian]

On Fri, 7 Mar 2025 23:17:53 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this revision of a previously puzzling comment intending to
> provide the rationale for a bit of non-obvious code.

Changes requested by bchristi (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/23952#pullrequestreview-2683222409