[Docs] Improve Turbo Module docs for EventEmitter

Summary

When writing a Turbo Module that contains an EventEmitter, you need to change your struct annotation from REACT_MODULE to REACT_TURBO_MODULE in order for the JS EventEmitter to be returned from the module.

It might be nice to include an example somewhere that shows a module that uses REACT_TURBO_MODULE and subscribes to the EventEmitter so users know when to use that over REACT_MODULE.

Motivation

I was running into an issue where I was trying to subscribe to an event in a turbo module:

  useEffect(() => {
    const subscription = NativeIRMenuItemManager.onMenuItemPressed(handleMenuItemPressed)
    return () => {
      subscription.remove()
    }
  }, [handleMenuItemPressed])

But the function kept throwing an error saying that the function was undefined. After more troubleshooting than I care to admit, I eventually ran across this PR that mentions the usage of REACT_TURBO_MODULE. I was following the Native Modules docs and looking at this example and both of them use REACT_MODULE so I didn't know that REACT_TURBO_MODULE existed.

Basic Example

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Open Questions

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