docs(plugin-sass): improve rewriteUrls option

[chenjiahan]

Summary

This pull request includes updates to the documentation for the pluginSass configuration option, specifically adding details about the rewriteUrls option.

Related Links

• feat(plugin-sass): add useOriginalUrlResolver option to disable resolve-url-loader #4389
• chore(plugin-sass): rename unreleased option #4398

Checklist

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

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