[Docs] Correct parameter in transcription API tutorial

[davidgao7]

The tutorial was using --static-model-types "transcription" but the actual implementation requires --static-model-labels "transcription" for proper routing of transcription requests.

This fixes the documentation mismatch where the tutorial didn't align with the actual code implementation in the routing logic.

When I implement transcription API I don't know how to get router print debug log; I tested to see if the debug logging work

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Mentioned here #469 (comment) (link existing issues this PR will resolve)

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[max-wittig]

I think this should actually use static-model-types and not static-model-labels as this is meant for the LM-Cache.

[davidgao7]

I think this should actually use static-model-types and not static-model-labels as this is meant for the LM-Cache.

Thanks for the reply, Max!

I see, so I should update the code to use --static-model-types instead of --static-model-labels. I'm not very familiar with the LM-Cache part of the codebase - could you briefly explain where static-model-labels is used there? Just a quick pointer would help me understand the distinction better, and I can check the details myself.

I'll update both the code and documentation to use static-model-types for this PR.

[max-wittig]

@davidgao7 There is another issue. I will take care of it here: #681