Add doc for printing LSP server logs

[PrimeTimeTran]

I'm working on getting a handle on logging so implement features like list suggestions, next suggestion, select suggestions, etc.

I've got LSP-AI working on my local & can start the extension and generate a response as well as confirm the generation.

I set LSP_AI_LOG=DEBUG before running app.

However I haven't gotten a handle on how to print LSP server logs.

Can we add doc explaining that?