docs(Firestore): Adding examples for v22

[Bilal-Abdeen]

Description

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;
  • [x ] Android
  • [x ] iOS
  • [x ] Other (macOS, web)
• 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
  • [x ] No

Test Plan

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[gemini-code-assist]

Code Review

This pull request updates the Firestore usage documentation to include code examples for the modular API introduced in React-Native-Firebase v22, providing side-by-side comparisons with the legacy namespaced API. The review feedback highlights several issues in the new code snippets, specifically missing database initialization (db = getFirestore()) and missing imports in certain examples. Additionally, it is noted that initializeFirestore should be awaited to ensure configuration settings are properly applied before further interactions.

[Bilal-Abdeen]

Removed old examples (before v22)