adds expo lib link to our docs for apple sign in

Author: rishabhpoddar

v2/thirdparty/custom-ui/thirdparty-login.mdx

@@ -307,12 +307,14 @@ This flow is not applicable for web apps.
 
 <h4>Step 1) Fetching the authorisation token on the frontend</h4>
 
-This involves setting up the [react-native-apple-authentication library](https://github.com/invertase/react-native-apple-authentication) in your app. Checkout their `README` for steps on how to integrate their SDK into your application. The minimum scope required by SuperTokens is the one that gives the user's email (In case of Apple, that could be the user's actual email or the proxy email provided by Apple - it doesn't really matter).
+For react native apps, this involves setting up the [react-native-apple-authentication library](https://github.com/invertase/react-native-apple-authentication) in your app. Checkout their `README` for steps on how to integrate their SDK into your application. The minimum scope required by SuperTokens is the one that gives the user's email (In case of Apple, that could be the user's actual email or the proxy email provided by Apple - it doesn't really matter).
 
 Once the integration is done, you should call the `appleAuth.performRequest` function for iOS and the `appleAuthAndroid.signIn` function for Android. Either way, the result of the function will be a one time use auth code which you should send to your backend as shown in the next step.
 
 A full example of this can be found in [our example app](https://github.com/supertokens/supertokens-react-native/blob/master/examples/with-thirdparty/apple.ts).
 
+In case you are using Expo, you can use the [expo-apple-authentication](https://docs.expo.dev/versions/latest/sdk/apple-authentication/) library instead (not that this library only works on iOS).
+
 </TabItem>
 
 <TabItem value="android">

v2/thirdpartyemailpassword/custom-ui/thirdparty-login.mdx

@@ -310,12 +310,14 @@ This flow is not applicable for web apps.
 
 <h4>Step 1) Fetching the authorisation token on the frontend</h4>
 
-This involves setting up the [react-native-apple-authentication library](https://github.com/invertase/react-native-apple-authentication) in your app. Checkout their `README` for steps on how to integrate their SDK into your application. The minimum scope required by SuperTokens is the one that gives the user's email (In case of Apple, that could be the user's actual email or the proxy email provided by Apple - it doesn't really matter).
+For react native apps, this involves setting up the [react-native-apple-authentication library](https://github.com/invertase/react-native-apple-authentication) in your app. Checkout their `README` for steps on how to integrate their SDK into your application. The minimum scope required by SuperTokens is the one that gives the user's email (In case of Apple, that could be the user's actual email or the proxy email provided by Apple - it doesn't really matter).
 
 Once the integration is done, you should call the `appleAuth.performRequest` function for iOS and the `appleAuthAndroid.signIn` function for Android. Either way, the result of the function will be a one time use auth code which you should send to your backend as shown in the next step.
 
 A full example of this can be found in [our example app](https://github.com/supertokens/supertokens-react-native/blob/master/examples/with-thirdparty/apple.ts).
 
+In case you are using Expo, you can use the [expo-apple-authentication](https://docs.expo.dev/versions/latest/sdk/apple-authentication/) library instead (not that this library only works on iOS).
+
 </TabItem>
 
 <TabItem value="android">

v2/thirdpartypasswordless/custom-ui/thirdparty-login.mdx

@@ -310,12 +310,14 @@ This flow is not applicable for web apps.
 
 <h4>Step 1) Fetching the authorisation token on the frontend</h4>
 
-This involves setting up the [react-native-apple-authentication library](https://github.com/invertase/react-native-apple-authentication) in your app. Checkout their `README` for steps on how to integrate their SDK into your application. The minimum scope required by SuperTokens is the one that gives the user's email (In case of Apple, that could be the user's actual email or the proxy email provided by Apple - it doesn't really matter).
+For react native apps, this involves setting up the [react-native-apple-authentication library](https://github.com/invertase/react-native-apple-authentication) in your app. Checkout their `README` for steps on how to integrate their SDK into your application. The minimum scope required by SuperTokens is the one that gives the user's email (In case of Apple, that could be the user's actual email or the proxy email provided by Apple - it doesn't really matter).
 
 Once the integration is done, you should call the `appleAuth.performRequest` function for iOS and the `appleAuthAndroid.signIn` function for Android. Either way, the result of the function will be a one time use auth code which you should send to your backend as shown in the next step.
 
 A full example of this can be found in [our example app](https://github.com/supertokens/supertokens-react-native/blob/master/examples/with-thirdparty/apple.ts).
 
+In case you are using Expo, you can use the [expo-apple-authentication](https://docs.expo.dev/versions/latest/sdk/apple-authentication/) library instead (not that this library only works on iOS).
+
 </TabItem>
 
 <TabItem value="android">