fix(template): reference App.tsx vs App.js in template text (#35377)
fix(template): reference App.tsx vs App.js in template text (#35377)

Summary:
The template has moved to typescript now, the self-reference needed an update

## Changelog

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[GENERAL] [FIXED] - reference App.tsx vs App.js in text of new typescript template

Pull Request resolved: https://github.com/facebook/react-native/pull/35377

Test Plan: It is just a text change - it either makes sense or it doesn't. I think it makes sense?

Reviewed By: cipolleschi

Differential Revision: D41386912

Pulled By: NickGerleman

fbshipit-source-id: 6e62c11567e8fbff70b123446a827b18af43e864

facebook/react-native,facebook/react-native,facebook/react-native,facebook/react-native,facebook/react-native,facebook/react-native,facebook/react-native,facebook/react-native,facebook/react-native