[Browser Rendering] Fix how to AI example formatting

[Yizack]

Summary

• Added missing function reserved word to getLLMResult
• Fixed body format
• Fixed indentation

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Updated the AI example formatting in the Browser Rendering documentation to improve clarity and correctness.

• Added missing 'function' keyword to the getLLMResult function
• Corrected body format and indentation for better readability
• Ensured adherence to the documentation style guide

Modified Files

• src/content/docs/browser-rendering/how-to/ai.mdx

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