docs: create improve-doc-authenticity.prompt.yml for code example quality

[Copilot]

This PR adds a new prompt configuration file improve-doc-authenticity.prompt.yml to complement the existing docs-en-improvement.prompt.yml. While the existing file focuses on improving the naturalness of English documentation translated from Chinese, this new prompt file focuses on improving the authenticity and accuracy of code examples throughout the documentation.

Purpose

The new prompt configuration provides AI-assisted guidelines for ensuring that:

• Code examples are accurate, runnable, and follow best practices
• Configuration examples are complete and valid
• Variable names and values are realistic (not just placeholder text)
• Import statements and dependencies match what's actually available
• File paths, package names, and API references are correct

Key Features

The prompt instructs contributors to:

• Verify that code examples actually work before committing changes
• Use realistic identifiers instead of generic placeholders like foo and bar (unless demonstrating a concept)
• Update both English (docs/en) and Chinese (docs/zh) versions when making technical changes
• Add error handling or edge cases where appropriate
• Keep examples simple but complete enough to be useful

Consistency

The file follows the same structure and conventions as docs-en-improvement.prompt.yml:

• Uses YAML format with the same schema
• References the same model (openai/gpt-5)
• Maintains similar constraints (max 10 files per PR, docs: prefix for PR titles)
• Scopes work to the website/docs directory

This addition enables more focused improvements to the Rsbuild documentation by separating concerns between language quality and technical accuracy.

Original prompt

@improve_doc_authenticity.md

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