RFR: 8276700: Improve java.lang.ref.Cleaner javadocs

[Hendrik Schreiber]

On Fri, 5 Nov 2021 10:13:47 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Trivial improvement.
>> 
>> Explicitly show how to create a `Cleaner` instance using `Cleaner.create()`.
>> Repeat (again) in the code example that the `State` `Runnable `should be implemented as static class and not reference the instance to be cleaned, to make the point even more clear to those people who never read the javadoc *prose*.
>> 
>> I have signed the OCA a while back as [hschreiber](https://openjdk.java.net/census#hschreiber).
>
> Submitted the RFE for it. Please change the PR title to "8276700: Improve java.lang.ref.Cleaner javadocs" to let bots hook it up.

Thanks, @shipilev .

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PR: https://git.openjdk.java.net/jdk/pull/6076