Add instructions to template/ios/Podfile for enabling hermes (#30461)
Add instructions to template/ios/Podfile for enabling hermes (#30461)

Summary:
Just thought I'd add these instructions so devs don't have to check the docs. Also, it makes iOS match Android with instructions in the configuration files
## Changelog
N/A (in my opinion)

Pull Request resolved: https://github.com/facebook/react-native/pull/30461

Test Plan: N/A (because not a code change)

Reviewed By: hramos

Differential Revision: D25309687

Pulled By: TheSavior

fbshipit-source-id: a1907089b9d2e7fe6f2498ce27129c3ae65f7c9a

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