RFR: 8357063: Document preconditions for DecimalDigits methods [v4]

[Volkan Yazici]

On Fri, 16 May 2025 16:10:29 GMT, Shaojin Wen <swen at openjdk.org> wrote:

>> Similar to PR #24982 
>> Document preconditions on certain DecimalDigits methods that use operations either unsafe and/or without range checks.
>
> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   warning

Marked as reviewed by vyazici (Author).

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PR Review: https://git.openjdk.org/jdk/pull/25246#pullrequestreview-2851630246