update nextjs docs

apps/docs/src/pages/docs/nextjs.mdx

@@ -189,9 +189,9 @@ clear();
 If you want to track server-side events, you should create an instance of our Javascript SDK. It's exported from `@openpanel/nextjs`
 
 <Callout>
-When using server events it's important to create a new client (with a secret). Since it's backend we cannot authorize the request with cors headers.
+When using server events it's important that you use a secret to authenticate the request. This is to prevent unauthorized requests since we cannot use cors headers.
 
-`Openpanel Dashboard -> Setting -> Clients -> Create client`
+You can use the same clientId but you should pass the associated client secret to the SDK.
 
 </Callout>
 
@@ -214,6 +214,7 @@ opServer.event('my_server_event', { profileId: '123', ok: '✅' });
 With `createNextRouteHandler` you can proxy your events through your server, this will ensure all events are tracked since there is a lot of adblockers that block requests to third party domains.
 
 ```typescript
+// file: /app/api/op/[...op]/route.ts
 import { createNextRouteHandler } from '@openpanel/nextjs';
 
 export const { POST } = createNextRouteHandler({
@@ -221,3 +222,13 @@ export const { POST } = createNextRouteHandler({
   clientSecret: '{YOUR_CLIENT_SECRET}',
 });
 ```
+
+Remember to change the `url` in the `OpenpanelProvider` to your own server.
+
+```tsx
+<OpenpanelProvider
+  url="/api/op" // <---
+  clientId="your-client-id"
+  trackScreenViews={true}
+/>
+```