容器管理 - 在集群中部署第二调度器文档中extender中urlprefix的获取能否写的更详细一点？

[shijinye]

Describe the bug
容器管理 - 在集群中部署第二调度器文档中extender中urlprefix的获取能否写的更详细一点？

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To Reproduce

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1. Go to '...'
2. Click on '...'
3. Scroll down to '...'
4. See error

Expected behavior

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Screenshots

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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context

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[zhiyingfang2022]

done：#4010