RFR: 8359919: Minor java.util.concurrent doc improvements [v18]

[Alan Bateman]

On Tue, 24 Jun 2025 15:21:15 GMT, Doug Lea <dl at openjdk.org> wrote:

>> This collects miscellaneous open issues that can be resolved with documentation updates; each indicated by adding JDK issue numbers
>
> Doug Lea has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add JDK-8311131

Latest version (with the "bulk" update to CHM) looks good.

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Marked as reviewed by alanb (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/25880#pullrequestreview-2954677539