RFR: 8321631: Fix comments in access.hpp

[Guoxiong Li]

On Sat, 9 Dec 2023 21:50:10 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

>> Hi all,
>> 
>> This trivial patch fixes the comments about `atomic_xchg` and `atomic_xchg_at` in `access.hpp`.
>> And it removes the unnecessary content about `INSTANTIATE_HPP_ACCESS` 
>> which has been aleready removed in [JDK-8230808](https://bugs.openjdk.org/browse/JDK-8230808).
>> 
>> Thanks for the review.
>> 
>> Best Regards,
>> -- Guoxiong
>
> Marked as reviewed by eosterlund (Reviewer).

@fisk @stefank Thanks for the reviews. Integrating.

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PR Comment: https://git.openjdk.org/jdk/pull/17042#issuecomment-1851427675