RFR: 8372393: Document requirement for separate metallib installation with Xcode 26.1.1 [v2]

[Erik Joelsson]

On Thu, 27 Nov 2025 11:04:29 GMT, Galder Zamarreño <galder at openjdk.org> wrote:

>> Document the metal toolchain requirements starting with Xcode 26.
>
> Galder Zamarreño has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix line breaks

Marked as reviewed by erikj (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28489#pullrequestreview-3525324245