RFR: 8375237: Document existing exceptional behavior of divideUnsigned and remainderUnsigned

[Joe Darcy]

On Wed, 14 Jan 2026 05:59:54 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> Happened to notice the divideUnsigned and reminaderUnsigned methods don't document throwing ArithmeticException for a zero divisor so added I'm proposing to add the appropriate throws clauses.
> The CSR is ready to review too.

The regression tests already cover the exceptional behavior so this PR doesn't include any test updates:

https://github.com/openjdk/jdk/blob/b082a390b77fca7134000bfe631f73bfd082bfa1/test/jdk/java/lang/Integer/Unsigned.java#L364
https://github.com/openjdk/jdk/blob/b082a390b77fca7134000bfe631f73bfd082bfa1/test/jdk/java/lang/Long/Unsigned.java#L435

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PR Comment: https://git.openjdk.org/jdk/pull/29215#issuecomment-3747922752