Add notes for iOS 18 Apple Intelligence

[jerielng]

Why are you making this change? (required)

Add notes on the behavior of iOS 18's Apple Intelligence and how it can/cannot impact customers.

Related PRs, issues, or features (optional)

• N/A

Feature release date (optional)

• N/A

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Thanks for contributing! We look forward to reading your work.

[hokstuff]

One suggestion, LGTM

[vanessaland]

LGTM!

[jerielng]

Hey @internetisaiah this should be ready for tech writer review now! Thank you!

[internetisaiah]

LGTM