Update docs to simplify the specification of Xcode/SDK versioning.
Update docs to simplify the specification of Xcode/SDK versioning.

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PiperOrigin-RevId: 141220359
MOS_MIGRATED_REVID=141220359

davidzchen/bazel-website,bazelbuild/bazel-website,davidzchen/bazel-website,davidzchen/bazel-website,bazelbuild/bazel-website,bazelbuild/bazel-website,davidzchen/bazel-website