docs: polish English phrasing in basic guides

[chenjiahan]

Summary

• improve clarity in the static deployment guide, especially around dist structure and asset prefixes
• refine the dev server description to better distinguish Rsbuild from other CLIs
• simplify wording about WebAssembly asset output locations

Testing

• not run (docs only)

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Codex Task

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[Copilot]

Pull request overview

This PR improves the clarity and readability of English documentation in three basic guide files by using more active voice, simplifying phrasing, and making technical descriptions more direct.

• Simplified passive constructions to active voice throughout
• Clarified descriptions of asset output locations and deployment scenarios
• Refined technical distinctions between different development servers

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
website/docs/en/guide/basic/wasm-assets.mdx	Simplified description of WebAssembly asset output location using active voice
website/docs/en/guide/basic/static-deploy.mdx	Improved clarity in multiple areas: introduction, dist directory configuration, subdirectory deployment, and CDN deployment descriptions
website/docs/en/guide/basic/server.mdx	Refined the description of Rsbuild's dev server to better distinguish it from other CLIs

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