Update user-identity.mdx

Remove frontend id method

Author: shalomgk

fern/docs/pages/plug-sdk/web/user-identity.mdx

@@ -120,41 +120,3 @@ const sessionToken = '<SESSION_TOKEN>'
         })})();
 </script>
 ```
-
-## Identify users without session token
-
-You can also pass the identifiers in the `plugSDK.init` option without generating the session token.
-
-<Callout intent="note">
-This frontend user identification, by its nature, is not secure as the data is transmitted through the client side. It is recommended to use the session token method to securely identify users.
-</Callout>
-
-```jsx
-window.plugSDK.init({
-  app_id: '<your_unique_app_id>',
-  identity: {
-    user_ref: string;
-    user_traits?: { // optional
-      custom_fields?: object; // optional
-      display_name?: string; // optional
-      email?: string; // optional
-      phone_numbers?: string[]; // optional
-    }
-  }
-})
-```
-
-You can add or update the data in `user_traits` by using the `updateIdentity` method on the PLuG SDK. Attached is a sample code snippet for the same. 
-
-```jsx
-window.plugSDK.updateIdentity({
-  user_traits: {
-    custom_fields?: object; // optional
-    display_name?: string; // optional
-    email?: string; // optional
-    phone_numbers?: string[]; // optional
-  }
-})
-```
-
-