docs: update prompt_templates.mdx

[prem-sagar123]

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    HumanMessage(content="What's the capital of France?"),
    AIMessage(content="The capital of France is Paris."),
    HumanMessage(content="And what about Germany?")
]
formatted_prompt = prompt_template.invoke({"msgs": messages_to_pass})
print(formatted_prompt)```

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[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #32405 will not alter performance

_{Comparing prem-sagar123:patch-1 (d602d17) with master (9de0892)}

⚠️ 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 #32405 will not alter performance

_{Comparing prem-sagar123:patch-1 (d602d17) with master (9de0892)}

Summary

✅ 14 untouched benchmarks