Update Podfile setup

[ray-holland-es]

use_flipper is deprecated, updated the Podfile setup to match the docs for Automatic setup

Summary

The docs for setting up Podfile are out of date and using a method that is deprecated.

Changelog

Update React Native - Manual iOS Setup Documentation

Test Plan

n/a

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[fxlrnrpt]

@ray-holland-es should it be a separate section for React Native 0.69+?

[coveralls]

Pull Request Test Coverage Report for Build 3046898933

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.03%) to 49.944%

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Totals
Change from base Build 3038849257:	-0.03%
Covered Lines:	7830
Relevant Lines:	14225

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💛 - Coveralls