Update README.md

Author: icedevml

packages/demo-ndef-app/README.md

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 Demo React Native application using `@icedevml/react-native-host-card-emulation` in order to emulate NFC Forum Type 4 Tag with an example URL NDEF.
 
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 > Make sure you have completed the [React Native's Set Up Your Environment](https://reactnative.dev/docs/set-up-your-environment) guide before proceeding.
 
-> [!NOTE]
+> [!TIP]
 > For iOS, you will first need to [request the HCE entitlement](https://developer.apple.com/contact/request/hce-entitlement/) for using ISO7816 AID `D2760000850101` (i.e. NFC Forum Type 4 Tag - NDEF) before you can run this app.
 
 ## Prerequisites