docs(app, ios): note pod install required for ios_config changes

[mikehardy]

Description

This wastes developer time and deserves a big note

Related issues

Idea from invertase/react-native-google-mobile-ads#550

Release Summary

docs only, 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

Documentation in form of shell script comments only, no tests needed though obviously iOS e2e should pass to confirm that

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Name	Status	Preview	Updated (UTC)
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[codecov]

Codecov Report

Merging #7631 (fc0c795) into main (2ff569d) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #7631   +/-   ##
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  Coverage     53.22%   53.22%           
  Complexity      742      742           
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  Files           251      251           
  Lines         12426    12426           
  Branches       1938     1938           
=========================================
  Hits           6612     6612           
  Misses         5466     5466           
  Partials        348      348