RFR: 8357821: Revert incorrectly named JavaLangAccess::unchecked* methods [v2]

[Per Minborg]

On Thu, 5 Jun 2025 06:04:49 GMT, Volkan Yazici <vyazici at openjdk.org> wrote:

>> Reverts certain [JDK-8353197](https://bugs.openjdk.org/browse/JDK-8353197) (which implements JavaDoc improvement and precautionary naming for certain unsafe methods in `jdk.internal.access.JavaLangAccess`) changes that are found to be incorrect. See the JBS issue for details on the followed evaluation process.
>
> Volkan Yazici has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add `@implSpec`

LGTM. Thank you for these updates!

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Marked as reviewed by pminborg (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/25545#pullrequestreview-2899838166