[BD-3202] Clarifying headless UI for Apple TV

[internetisaiah]

Summary

Making it more clear that users can use the Swift SDK to implement in-app messaging for Apple TV (along with other Headless UI features), however Braze doesn't provide any out of the box UI for tvOS within the Swift SDK. Customers will need to implement their own UI, but they do have access to the messaging data models.

Related PRs, issues, or features (optional)

• BD-3202

Feature release date (optional)

• N/A

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[jerielng]

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