docs: update 3.x upgrade instructions about x6-common and x6-geometry

[GaoFuhong]

📝 Description

添加关于2.x 中 x6-common 和 x6-geometry 两个子包的升级说明。

🖼️ Screenshot

Before	After
❌	✅

💡 Motivation and Context

🧩 Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Enhancement (changes that improvement of current feature or performance)
• Refactoring (changes that neither fixes a bug nor adds a feature)
• Test Case (changes that add missing tests or correct existing tests)
• Code style optimization (changes that do not affect the meaning of the code)
• Docs (changes that only update documentation)
• Chore (changes that don't modify src or test files)

🔍 Self Check before Merge

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[gemini-code-assist]

Summary of Changes

Hello @GaoFuhong, 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 3.x upgrade guide by adding crucial information regarding the consolidation of @antv/x6-common and @antv/x6-geometry into the core @antv/x6 package. The updated documentation provides clear instructions on how to adjust package.json dependencies and modify import statements, ensuring a smoother transition for users migrating their projects.

Highlights

• Documentation Update: The pull request updates the 3.x upgrade documentation for @antv/x6.
• Package Consolidation: It clarifies that @antv/x6-common and @antv/x6-geometry are now merged into the main @antv/x6 package.
• Dependency Removal: Users upgrading to 3.x should remove @antv/x6-common and @antv/x6-geometry from their package.json.
• Import Path Changes: New examples are provided to show how to import utilities and geometry types directly from @antv/x6 instead of the separate packages.

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[gemini-code-assist]

Code Review

本次 PR 主要更新了 3.x 版本的升级文档，补充了关于 @antv/x6-common 和 @antv/x6-geometry 两个子包合并到主包的说明，内容清晰，对用户升级非常有帮助。我对中英文文档中的一些表述提出了修改建议，旨在让文案更加清晰易懂。整体来看，这是一次不错的文档改进。