commit doc

[liuyueran123]

closes: #ISSUE_Number

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Change logs

Describe your change clearly, including what problem is being solved or what document is being added or updated.

Contributor's checklist

Here are some reminders before you submit your pull request:

• Make sure that your Pull Request has a clear title and commit message. You can take the Git commit template as a reference.
• Learn the code contribution and doc contribution guides for better collaboration.
• Make sure that your changes deployment preview is successful.
• List your communications in the GitHub Issues or Discussions (if has or needed).
• Feel free to ask for the cloudberry committers or other people to help review and approve.

[github-actions]

Hiiii, @liuyueran123 welcome!🎊 Thanks for taking the effort to make our project better! 🙌 Keep making such awesome contributions!

[TomShawn]

Suggested change

	pg_verifybackup 能够验证 PostgreSQL 集群基础备份的完整性。本文档介绍 Cloudberry 系统工具：pg_verifybackup 的功能。
	本文档介绍 Apache Cloudberry 系统工具 `pg_verifybackup`，该命令行工具可用于验证 Apache Cloudberry 集群基础备份的完整性。

[TomShawn]

后面部分文字缺乏 proofread，需要提高可读性。

[TomShawn]

PR 标题以及描述应该清晰地反映所提交的内容，让 reviewer 不点开看具体的文件改动也能快速了解 PR 情况。