docs(app-check): update doc accordingly to new AppDelegate.swift in rn 0.79

[wneel]

Description

As the AppDelegate.swift file has been updated in react-native@0.79, the documentation needs to be updated accordingly ! Since it doesn't change that much I thought I could do it, here is the PR :)

This change have been tested in dev && prod but I didn't make any jest / e2e test yet

Related issues

Release Summary

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
  • Other (macOS, web)
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

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Name	Status	Preview	Comments	Updated (UTC)
react-native-firebase	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 20, 2025 10:25pm

[mikehardy]

Looks good, thank you!