docs: make it clear what platform support is required

[russellwheatley]

Description

Related issues

closes #7816

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

Test Plan

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Name	Status	Preview	Comments	Updated (UTC)
react-native-firebase	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 28, 2024 10:24am

[mikehardy]

just one thought on node versions, would love to try node 20

[mikehardy]

A thing of beauty :-)
This will unblock the PR #8095 for SDKs that I just posted also, as that blew up on outdated node...