docs: update document

[interstellarmt]

Checklist

• [x] documents are updated

Description of change

• #7234

• #7230

• full custom gauge style

[gemini-code-assist[bot]]

Summary of Changes

Hello @interstellarmt, I'm Gemini Code Assist[^1]! 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 significantly enhances the G2 charting library's documentation by clarifying the architectural design around the View component's children, guiding users on correct multi-view composition patterns. Additionally, it expands the example collection with a sophisticated, fully customizable gauge chart, showcasing advanced styling capabilities and improving the overall resourcefulness for developers.

Highlights

• Documentation Clarity for G2 Views: Updated the G2 documentation to explicitly clarify that the children property of a View component can only contain Marks (e.g., interval, line) and does not support nesting other View components directly. This addresses a common misunderstanding and related issue #7230.
• Multi-View Composition Guidance: Provided comprehensive solutions and examples for achieving multi-view compositions using appropriate top-level composite containers such as spaceFlex (parallel layout), spaceLayer (layered layout), and facet (faceted layout), along with a recommendation for combining multiple marks within a single view.
• New Gauge Chart Example: Introduced a new example demonstrating a fully customized gauge chart style, featuring a unique diamond-shaped glowing pointer, dynamic axis tick styling, and enhanced central text formatting with gradients and shadows.

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[coveralls]

Pull Request Test Coverage Report for Build 20094664360

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 79.915%

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Totals
Change from base Build 20093079215:	0.0%
Covered Lines:	10464
Relevant Lines:	12560

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💛 - Coveralls