Dashboard and Host details page: Tweak copy (#45245)

- Copy tweak to use platform ("iOS/iPadOS") instead of device name to be
consistent w/ "Android"

Tooltip copy before change:

<img width="369" height="97" alt="Screenshot 2026-05-12 at 12 11 41 PM"
src="https://github.com/user-attachments/assets/2ac23cdf-e1c7-4738-81f9-a53994c9be33"
/>


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Documentation**
* Updated MDM enrollment status tooltip to clarify device platform
requirements for Managed Apple Account sign-in.

[![Review Change
Stack](https://storage.googleapis.com/coderabbit_public_assets/review-stack-in-coderabbit-ui.svg)](https://app.coderabbit.ai/change-stack/fleetdm/fleet/pull/45245)

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

frontend/utilities/constants.tsx

@@ -372,7 +372,7 @@ export const MDM_STATUS_TOOLTIP: Record<
   ),
   "On (personal)": (
     <span>
-      MDM was turned on by signing in with Managed Apple Account on iPhone/iPad,
+      MDM was turned on by signing in with Managed Apple Account on iOS/iPadOS,
       or by creating a work profile on Android. End users can turn MDM off.
     </span>
   ),