docs: updates messaging docs for expo

[younes0]

Description

It mentions npx expo prebuild in the messaging docs.

Related issues

Release Summary

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • [X ] 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)
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[younes0]

wrong repo :)
but https://github.com/evennit/notifee-expo-plugin can still apply without notifee