Correct comments on the Core ML wheel library

[shoumikhin]

Summary

Fix three comments on the standalone Core ML delegate library in the macOS wheel. Comment changes only, no behavior change.

• The shipped dylib is retained because it is named directly on the link line, not by anything specific to the Mach-O format, and only -dead_strip_dylibs would drop it (nothing passes that).
• Linking the helper archives privately also keeps their include directories out of the library's export interface, which is intended, since a wheel consumer links the bundled delegate and never names the helpers.
• Shipping the delegate as a shared library moves a duplicate-symbol conflict from static-link time to load time; the single shipped library and the dynamic link keep exactly one copy in the process.

Test plan

Comment-only. Confirmed both CMake files still pass cmake-format.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/22242

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❌ You can merge normally! (1 Unrelated Failure), 1 Unclassified Failure

As of commit 24df64f with merge base d0c2da3 ():

UNCLASSIFIED FAILURE - DrCI could not classify the following job because the workflow did not run on the merge base. The failure may be pre-existing on trunk or introduced by this PR:

• Test ROCm AOTI / test-voxtral-realtime-rocm-gfx950-rocm7.1 / linux-job (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  RuntimeError: Command docker exec -t 5cd7811cd922af11efca812bcc7d838917856b482d6acbc30453e19beebb17e6 /exec failed with exit code 134

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-qnn-testsuite-linux / test-backend-linux (qnn, models) / linux-job (gh) (trunk failure)

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