Update README.md

docs/buildkit/README.md

@@ -151,7 +151,7 @@ console.log(`Server listening on port ${port}`);
 Once your server is connected to the Coordinator, you can start passing messages back and forth. Let's build a client to do that.
 
 1. In your typescript project, install the client SDKs: `npm i @hathora/client-sdk`
-2. Fill in the `APP_ID` from above. Establish a connection using the `onMessage` and `onError` methods:
+2. Fill in `YOUR_HATHORA_APP_ID`. Establish a connection using the `onMessage` and `onError` methods:
 
 ```ts
 // client.mts