docs(messaging, ios): add Background App Refresh / message handler interaction note

[roti-c137]

Description

Updated document to include Background App Refresh manual toggle on iOS devices. My understanding is in this scenario, setBackgroundMessageHandler would not trigger and the app will fallback to QUIT state's flow.

Related issues

resolves #5656

Release Summary

Updated document to include Background App Refresh manual toggle on iOS devices.

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes. Btw the contributor guide URL is invalid..
• 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

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[vercel]

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Name	Status	Preview	Updated
react-native-firebase	✅ Ready (Inspect)	Visit Preview	Jun 24, 2022 at 10:36PM (UTC)

1 Ignored Deployment

Name	Status	Preview	Updated
react-native-firebase-next	⬜️ Ignored (Inspect)		Jun 24, 2022 at 10:36PM (UTC)

[CLAassistant]

All committers have signed the CLA.

[mikehardy]

Sorry this has sat so long @roti-c137 ! It looks like a great addition, running it through CI checks now and will do the needful to get it in. Cheers

[roti-c137]

I'll need help on the 3 item that is failing...

1 - Spelling & Grammar (attached image), i've already run prettier on that .md file, nothing changes

2 - PR title is conventional - should i make another commit with commit message exactly the same PR title?

3 - Vercel Deployment failed. Showing this

[mikehardy]

I went through all the items here and rebased it against main then pushed it back to your branch, should work? 🤞