[crac] RFR: 8364554: [CRaC] Improve CRaC VM options' docs [v6]

[Radim Vansa]

On Fri, 8 Aug 2025 19:03:13 GMT, Timofei Pushkin <tpushkin at openjdk.org> wrote:

>> Besides some wording and formatting of VM options:
>> - Renames `CRaCAllowToSkipCheckpoint` to `CRaCSkipCheckpoint` since it makes the VM always skip checkpoints and not only in some cases
>> - Replaces `CRaCMaxHeapSizeBeforeCheckpoint == 0` with `FLAG_IS_DEFAULT(CRaCMaxHeapSizeBeforeCheckpoint)` because the docs 0 do not specify 0 as a special value
>
> Timofei Pushkin has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Expire CRaC's special options - attempt 2
>  - Revert "Expire CRaC's special options since JDK 26"
>    
>    This reverts commit a92d961609d1d96b479723787f035f13f8944d6e.

Marked as reviewed by rvansa (Committer).

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PR Review: https://git.openjdk.org/crac/pull/256#pullrequestreview-3104528808