[Website]: How do I find the endpoint in my Serverless Observability project?

### Type of issue

Missing information

### What documentation page is affected

https://www.elastic.co/docs/reference/opentelemetry/motlp

### What happened?

I was reading through the docs trying to find out how to set it up.

But I still don't understand what the endpoint is?

If I want to copy the endpoint to my otel collector config, what should that be?

### Additional info

_No response_