RFR: 8234131: Miscellaneous changes imported from jsr166 CVS 2020-12 [v3]

Mon Dec 14 00:44:55 UTC 2020

On Fri, 11 Dec 2020 15:07:45 GMT, Petr Janeček <github.com+1746404+JanecekPetr at openjdk.org> wrote:

>> The changes to doc comments look good.
>> 
>> Thanks for incorporating my earlier code snippet suggestions published on [concurrency-interest](http://cs.oswego.edu/pipermail/concurrency-interest/2020-November/017264.html)!
>
> This also fixes issue [JDK-8257671](https://bugs.openjdk.java.net/browse/JDK-8257671): _ThreadPoolExecutor.Discard*Policy: rejected tasks are not cancelled_, by updating the `TPE.Discard*Policy` JavaDocs.
> 
> I filed it days before the code went in as I did not see the JavaDoc update in JDK, sorry for my impatience and thank you for the fix. I cannot update the Jira, please link it to this PR, too.

@JanecekPetr Thank you very much.  I've updated JIRA and this pull request for JDK-8257671

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PR: https://git.openjdk.java.net/jdk/pull/1647