RFR: JDK-8151531: Add notes to BaseStream.spliterator/iterator docs regarding them being escape hatches [v3]

[Paul Sandoz]

On Wed, 10 May 2023 07:48:11 GMT, Viktor Klang <duke at openjdk.org> wrote:

>> Still relevant to address? /cc @PaulSandoz
>
> Viktor Klang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Updating copyright year

Marked as reviewed by psandoz (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/13890#pullrequestreview-1420974155