docs: 增加 tooltip 顺序的 faq

[interstellarmt]

Checklist

• documents are updated

Description of change

[gemini-code-assist]

Summary of Changes

Hello @interstellarmt, 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 enhances the documentation by introducing a new FAQ entry that clarifies the behavior of Tooltip and Legend sorting in G2 charts. It provides users with a clear understanding of why these components might display data in different orders and offers a direct, configurable solution to synchronize their sorting, thereby improving data interpretation and user experience.

Highlights

• New FAQ Entry: A new FAQ entry has been added to the documentation, addressing a common issue in data visualization.
• Tooltip and Legend Order Inconsistency: The new FAQ clarifies the problem of inconsistent sorting order between Tooltips and Legends in multi-series and multi-axis charts.
• Cause Analysis: It explains that Legends sort by definition order, while Tooltips default to sorting by visual position (Y-coordinate), leading to discrepancies.
• Solution Provided: A solution is provided using the interaction.tooltip.sort configuration to customize Tooltip sorting rules to match the Legend order.
• Code Examples: Practical JavaScript code examples are included for various custom sorting scenarios, such as matching legend order, alphabetical sorting, descending value sorting, and custom priority.

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[gemini-code-assist]

Code Review

本次 PR 新增了关于 G2 中 Tooltip 和图例顺序不一致问题的 FAQ 文档，包括中英文两个版本。文档清晰地解释了问题原因，并提供了使用 interaction.tooltip.sort 的解决方案和代码示例，内容翔实，对用户很有帮助。

我在代码示例中发现一处可以改进的地方：为了保持示例代码的一致性和可读性，建议为 call 和 mock 折线图的 encode 配置显式添加 series 通道。具体建议请见文件中的评论。

[coveralls]

Pull Request Test Coverage Report for Build 20987149821

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 79.949%

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Totals
Change from base Build 20802814813:	0.0%
Covered Lines:	10502
Relevant Lines:	12596

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💛 - Coveralls