docs: Update load balancing payload limit documentation to 30 MB (#443)

Co-authored-by: promptless[bot] <179508745+promptless[bot]@users.noreply.github.com>
Co-authored-by: Mo King <muhsinking@gmail.com>

Author: promptless[bot]

serverless/load-balancing/overview.mdx

@@ -181,6 +181,16 @@ If your server is misconfigured and the ports are not correctly opened, your wor
 
 </Warning>
 
+## Payload limits
+
+Load balancing endpoints have a 30 MB payload limit for both requests and responses.
+
+If you need to handle payloads larger than 30 MB, you can try these approaches:
+
+- Use a [network volume](storage/network-volumes) to store model artifacts and large datasets for access during runtime.
+- Implement chunking strategies to split large payloads into smaller pieces.
+
+
 ## Handling cold start errors
 
 When you first send a request to a load balancing endpoint, you might get a "no workers available" error. This happens because workers need time to initialize, i.e. the server is up, but the health check at `/ping` isn't passing yet.