[Doc]: LLM.wait_for_completion output_type default is inaccurate

[viiccwen]

📚 The doc issue

LLM.wait_for_completion() documents output_type as defaulting to RequestOutput, but the implementation defaults to accepting both RequestOutput and PoolingRequestOutput when output_type is not provided.

This can mislead readers into thinking the method only expects generation outputs by default, while the actual behavior is broader.

Suggest a potential alternative/fix

Update the output_type argument description to state that, when omitted, it accepts both RequestOutput and PoolingRequestOutput.

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