Document the metal toolchain requirements starting with Xcode 26. -------------
Commit messages: - Document Metal installation with XCode 26 Changes: https://git.openjdk.org/jdk/pull/28489/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28489&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8372393 Stats: 9 lines in 2 files changed: 9 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/28489.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/28489/head:pull/28489 PR: https://git.openjdk.org/jdk/pull/28489
