docs: multi environments build order

[chenjiahan]

Summary

This pull request includes updates to the documentation for controlling the build order of environments in Rsbuild.

Checklist

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

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[netlify]

✅ Deploy Preview for rsbuild ready!

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🔨 Latest commit	67a7508
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Lighthouse	1 paths audited Performance: 76 (🟢 up 2 from production) Accessibility: 97 (no change from production) Best Practices: 100 (no change from production) SEO: 100 (no change from production) PWA: 60 (no change from production) View the detailed breakdown and full score reports

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