RFR: 8335637: Add explicit non-null return value expectations to Object.toString() [v4]

[Jaikiran Pai]

On Wed, 10 Jul 2024 05:02:36 GMT, Joe Darcy <darcy at openjdk.org> wrote:

>> Make well-behaved implementation expectations of Object.{toString, hashCode} explicit.
>
> Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Narrow scope of the change.

The proposed reduction of the scope of the change to just note that `toString()` should return a non-null value looks good to me.

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Marked as reviewed by jpai (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/20063#pullrequestreview-2168038159