docs: Update for typescript

[zereight]

For react-native + typescript users, we changed a very minor phrase.

to

onlineManager.setEventListener((setOnline) => {
  return NetInfo.addEventListener((state) => {
    setOnline(!!state.isConnected);
  });
});

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Name	Status	Preview	Updated
query	✅ Ready (Inspect)	Visit Preview	Jul 8, 2022 at 5:32PM (UTC)

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