docs: add Qwen3 extended thinking example to ChatOllama notebook (#31633)

[Pranav-d33]

Adds an example in ollama.ipynb showing how to disable Qwen3's extended thinking mode using model_kwargs={"think": False}.

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Name	Status	Preview	Comments	Updated (UTC)
langchain	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 23, 2025 8:59pm

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #31705 will not alter performance

_{Comparing Pranav-d33:docs/qwen3-think-mode (1a52b54) with master (8868701)}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

✅ 13 untouched benchmarks

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #31705 will not alter performance

_{Comparing Pranav-d33:docs/qwen3-think-mode (1a52b54) with master (8868701)}

Summary

✅ 13 untouched benchmarks