docs: Add instructions for iOS AppDelegate.swift on react-native 0.77

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Description

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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
• 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

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Name	Status	Preview	Comments	Updated (UTC)
react-native-firebase	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 21, 2025 6:18pm

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Hello 👋, this PR has been opened for more than 2 months with no activity on it.

If you think this is a mistake please comment and ping a maintainer to get this merged ASAP! Thanks for contributing!

You have 15 days until this gets closed automatically

[mikehardy]

Really sorry for the delay here, the doc changes are of course correct

I ran yarn lint:markdown --write to fixup the trivial spacing issue lint noticed

I rebased to current main to fix the yarn lerna:prepare issue in CI for the unrelated vertexai package

Everything should go green after this and it'll be good to merge

Thanks again!