docs(messaging, ios): clarify that some simulators may get FCM messages now

[mikehardy]

Description

Attempting to clarify that modern simulators on modern macs may actually get APNs tokens and receive messages now. This was confusing before as the feature was announced earlier as part of breaking changes in react-native-firebase v17 but there was still some documentation around stating exactly the opposite

Related issues

#6893

Release Summary

docs, no release

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

Test Plan

Just docs, but if there was a typo or something, CI will find it...

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Name	Status	Preview	Comments	Updated (UTC)
react-native-firebase	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 11, 2023 0:14am
react-native-firebase-next	❌ Failed (Inspect)			Oct 11, 2023 0:14am