docs: improve browser logs documentation

[chenjiahan]

Summary

Add more comprehensive explanation about browser error forwarding feature, including support for unhandled Promise rejections. Also mention benefits for AI coding agents.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR improves the documentation for the browser-logs feature by providing more comprehensive explanations and clearer formatting.

Key changes:

• Enhanced description of error forwarding to include unhandled Promise rejections
• Added context about benefits for AI coding agents
• Reformatted example error output for better readability

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
website/docs/zh/config/dev/browser-logs.mdx	Updated Chinese documentation with expanded feature description and reformatted error example
website/docs/en/config/dev/browser-logs.mdx	Updated English documentation with expanded feature description and reformatted error example

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