RFR: 8359919: Minor java.util.concurrent doc improvements [v19]

[Alan Bateman]

On Thu, 26 Jun 2025 10:40:50 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:
> 
>   Use javadoc internal linkages in CHM

Marked as reviewed by alanb (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/25880#pullrequestreview-2961695042