Summary: Protobut -> Protobuf ## Changelog Fix a typo in setup.mdx Pull Request resolved: https://github.com/facebook/flipper/pull/3244 Test Plan: Imported from GitHub, without a `Test Plan:` line. **Static Docs Preview: flipper** |[Full Site](https://our.intern.facebook.com/intern/staticdocs/eph/D33457730/V2/flipper/)| |**Modified Pages**| Reviewed By: mweststrate Differential Revision: D33457730 Pulled By: passy fbshipit-source-id: 7f8a00e3239edb01afa4e6ebe2b77f1fe63ad865