Add iOS Linking location example to docs
Add iOS Linking location example to docs

Summary:
Hi, the docs make it seem like `geo:${latitude},${longitude}` is the cross-platform way to link locations on Google/Apple Maps. This is Android-only though.

I did no changes to code.

I noticed that the Appetize.io embed tries to run the [Linking example](https://facebook.github.io/react-native/docs/linking.html) code on iOS, although the example uses Android location scheme. This results in errors. I'd like to fix this as well, but I have no idea how to tell the demo to run on Android.
Closes https://github.com/facebook/react-native/pull/13220

Differential Revision: D4804123

Pulled By: hramos

fbshipit-source-id: 2de85d56476933ec54ea423d76a0fe98ed5132d3

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