docs: fix syntax error and add private API tip

[raushan728]

Fixed missing quotes in UPGRADING.md and added a note about private APIs to README.md. Minor documentation fix.

• Appropriate docs were updated

[gemini-code-assist]

Summary of Changes

Hello @raushan728, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on improving the clarity and correctness of the project's documentation. It resolves a minor syntax issue in the upgrade guide and introduces essential guidance for developers working with private APIs, ensuring a smoother experience for users of the library. The changes aim to make the documentation more accurate and helpful without altering any core functionality.

Highlights

• Documentation Fix: Corrected a syntax error in UPGRADING.md by adding missing quotes in a code example.
• Private API Guidance: Added a new section to README.md providing clear instructions and a code example for using private APIs with static_discovery=False.
• Readability Improvements: Applied minor formatting adjustments across both README.md and UPGRADING.md to enhance overall readability, including consistent spacing and heading styles.

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[gemini-code-assist]

Code Review

This pull request improves the documentation by fixing some formatting issues, correcting a syntax error in a code example, and adding a helpful note about using private APIs. The changes make the documentation clearer and more accurate. I have one suggestion to improve the clarity of an example in UPGRADING.md to avoid potential user confusion.