RFR: 8308645: Javadoc of FFM API needs to be refreshed [v4]

[Per Minborg]

On Fri, 2 Jun 2023 08:08:17 GMT, Per Minborg <pminborg at openjdk.org> wrote:

>> Right, I guess I'm asking: can/should we do better? ;) It might be nice to define the term once and for all for the entire JDK, similar to how 'reachability' also has a central definition. (and then add a link from here).
>> 
>> But, arguably, that seems like too much scope creep for this PR, so let's save it for a potential followup.
>
> I think there is something we could start off from: https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/annotations/ThreadSafe.html
> 
> This could be made under a separate issue.

https://bugs.openjdk.org/browse/JDK-8309342

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PR Review Comment: https://git.openjdk.org/jdk/pull/14098#discussion_r1214075735