[Chore] Enhance score description

[jiarong0907]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @jiarong0907, 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 refines the user-facing descriptions of various performance scores displayed on the Leaderboard page. The goal is to enhance clarity and understanding for users by providing more precise definitions for metrics such as Arena Score, Cost Ratio Score, and Optimality Score, ensuring that the purpose and calculation of each score are easily comprehensible.

Highlights

• Score Description Clarity: Updated the descriptions for "Arena Score", "Cost Ratio Score", and "Optimality Score" on the Leaderboard page to provide clearer explanations of what each metric represents.

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[gemini-code-assist]

Code Review

This pull request enhances the clarity of the score descriptions, which is a good improvement. The new text is more informative for users. I've provided a couple of suggestions to improve the consistency and conciseness of the terminology used across the different metric descriptions.

[gemini-code-assist]

For better terminological consistency, consider using 'optimal model' here. This term is introduced and defined in the 'Optimality Score' description below, and using it here would make the metric explanations more cohesive.

Suggested change

	Evaluates the cost of the router's choices relative to an oracle that always selects the cheapest correct model.
	Evaluates the cost of the router's choices relative to an oracle that always selects the optimal model.

[gemini-code-assist]

The definition of 'optimal model' is clear, but it could be more concise to improve readability. Using a shorter phrase would keep the parenthetical explanation brief and impactful.

Suggested change

	Measures how often a router selects the optimal model (i.e., the model answers the question correctly with the lowest cost).
	Measures how often a router selects the optimal model (i.e., the cheapest correct model).