Add note on how to determine allowlist urls for expo (#1693)

Co-authored-by: Alexis Aguilar <[email protected]>

docs/deployments/deploy-expo.mdx

@@ -17,11 +17,21 @@ Clerk ensures that security critical nonces will be passed only to allowlisted U
 
 So for maximum security in your production instances, you need to allowlist your custom redirect URLs:
 
-1. Navigate to the [Clerk Dashboard](https://dashboard.clerk.com/last-active?path=user-authentication/sso-connections).
-1. In the top navigation, select **Configure**. Then in the sidebar, select **SSO Connections**.
+1. In the Clerk Dashboard, navigate to the [**SSO Connections**](https://dashboard.clerk.com/last-active?path=user-authentication/sso-connections) page.
 1. Scroll to the **Allowlist for mobile OAuth redirect** section and add your redirect URLs.
-   1. The default is `your-app-scheme://oauth-native-callback`
-   1. If you'd like to pass a custom redirect url, make sure you add that to the allowlist.
+   1. The default is `<INSERT-YOUR-APP-SCHEME>://oauth-native-callback`
+   1. If you'd like to pass a custom redirect URL, make sure you add that to the allowlist. The format is `<INSERT-YOUR-APP-SCHEME>/{PATH}`. For example, the redirect URL for the following code example is `myapp://dashboard`.
+      ```ts
+      const { startOAuthFlow } = useOAuth({ strategy: `oauth_apple` })
+
+      const onPress = React.useCallback(async () => {
+        const { createdSessionId, setActive } = await startOAuthFlow({
+          redirectUrl: Linking.createURL('dashboard', { scheme: 'myapp' }),
+        })
+
+        // The rest of your code...
+      }, [])
+      ```
 
 > [!TIP]
 > You can also add redirect URLs via [the Backend API](/docs/reference/backend-api/tag/Redirect-URLs#operation/CreateRedirectURL).