Summary:
This PR fixes a broken `Troubleshooting` link in the iOS setup page as well as adds that link to the React Native iOS one.
## Changelog
Add correct `Troubleshooting` page links
Pull Request resolved: https://github.com/facebook/flipper/pull/1013
Test Plan: Check `docs/getting-started/native-ios` and `docs/getting-started/react-native-ios`.
Reviewed By: mweststrate
Differential Revision: D21042264
Pulled By: passy
fbshipit-source-id: 3b069b3ffa51d5d290af410d8c85ecb316d76c32
bb3159df83