Docs: ios-native-ui-guide RCTConvert categories edit
Docs: ios-native-ui-guide RCTConvert categories edit

Summary:
I was struggling a bit with the [iOS Native UI Components tutorial](https://facebook.github.io/react-native/docs/native-components-ios.html#content).

As noted here it's outdated. https://github.com/facebook/react-native/issues/14436

In my opinion, these steps are more clear when the header files are also included in the example. Besides that, the tutorial can use the already existing `RCTConvert+CoreLocation` category for simplicity.
Closes https://github.com/facebook/react-native/pull/14983

Differential Revision: D5409803

Pulled By: javache

fbshipit-source-id: f7fe1d2b542e8df602dc0f0636efb4d764090811

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