[Docs] iOS docs unusable for Expo

[iway1]

https://react-native-google-signin.github.io/docs/setting-up/ios

This is really confusing for Expo developers ^. It's not clear if it's required for Expo users, and if it is it makes this package unusable because it requires manually editing native code, or at least writing a config plugin

[vonovak]

Hello and thanks for the feedback, do you find it better now?

Thank you 🙂

[vonovak]

I'm going to assume the docs are usable and the issue is fixed 🙂

Thank you