docs(guide): fix improper punctuation in Chinese guide

[miownag]

Summary

This pull request fixes some incorrect punctuation usage in the Chinese guide documentation. The commas have been changed to enumeration commas.

Related Links

https://rsbuild.dev/zh/guide/start/index

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[CLAassistant]

All committers have signed the CLA.

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