docs: update snippet for `Create a k-means` model tutorial

[arwas11]

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Fixes #412723079 🦕

[review-notebook-app[bot]]

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[arwas11]

Notebook failure seems to be unrelated

=========================== short test summary info ============================
FAILED notebooks/generative_ai/bq_dataframes_llm_kmeans.ipynb::bq_dataframes_llm_kmeans.ipynb - IndexError: single positional indexer is out-of-bounds
======================== 1 failed in 248.20s (0:04:08) =========================
Benchmark failed, deleting: notebooks/generative_ai/bq_dataframes_llm_kmeans.ipynb.slotmillis
Benchmark failed, deleting: notebooks/generative_ai/bq_dataframes_llm_kmeans.ipynb.bytesprocessed
Benchmark failed, deleting: notebooks/generative_ai/bq_dataframes_llm_kmeans.ipynb.query_char_count
Benchmark failed, deleting: notebooks/generative_ai/bq_dataframes_llm_kmeans.ipynb.bq_exec_time_seconds
Benchmark failed, deleting: notebooks/generative_ai/bq_dataframes_llm_kmeans.ipynb.local_exec_time_seconds
notebooks/location/regionalized.ipynb .                                  [100%]

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[tswast]

Wait for samples tests to pass before merging.