feat(scrollbar): scrollbar docs update

[ai-qing-hai]

更新 scrollbar 组件文档

• fixed [Docs]: 改造文档「图表组件- 滚动条（Scrollbar）」 #6689

[petercat-assistant]

Walkthrough: 本次更新主要涉及到 G2 中滚动条（Scrollbar）组件文档的更新。文档新增了关于滚动条的概述、使用场景、配置项、样式配置及事件监听的详细说明，并提供了相关代码示例，帮助用户更好地理解和使用滚动条组件。

Changes:

文件	概要
site/docs/manual/component/scrollbar.zh.md	更新了滚动条组件的文档，增加了概述、使用方式、配置项、样式配置及事件监听的详细说明，并提供了代码示例。

[coveralls]

Pull Request Test Coverage Report for Build 13986548838

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 12 unchanged lines in 1 file lost coverage.
• Overall coverage remained the same at 86.7%

---

Files with Coverage Reduction	New Missed Lines	%
src/interaction/tooltip.ts	12	91.2%

Totals
Change from base Build 13945498334:	0.0%
Covered Lines:	10633
Relevant Lines:	11889

---

💛 - Coveralls