docs: remove duplicate guide info (#3906)
docs: remove duplicate guide info (#3906)

Summary:
Duplicate info seem to exist in the getting started guide

## Changelog

Pull Request resolved: https://github.com/facebook/flipper/pull/3906

Test Plan:
Imported from GitHub, without a `Test Plan:` line.

**Static Docs Preview: flipper**
|[Full Site](https://our.intern.facebook.com/intern/staticdocs/eph/D37927352/V2/flipper/)|

|**Modified Pages**|
|[docs/getting-started/react-native](https://our.intern.facebook.com/intern/staticdocs/eph/D37927352/V2/flipper/docs/getting-started/react-native/)|

Reviewed By: lblasa

Differential Revision: D37927352

Pulled By: passy

fbshipit-source-id: 8dae61b1d13bf4d3ab7eb83c140847fc9856daf9

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