docs: improve English clarity in documentation

[Copilot]

Rewrote unnatural English in 5 documentation files to sound more professional and native, following the pattern of high-quality open-source docs.

Changes

• cache.mdx: Removed verbose phrasing ("will cache... and use them in the next build" → "caches... then reuses them in subsequent builds")
• tree-shaking.mdx: Simplified awkward constructions ("terminology widely used within the JavaScript ecosystem defined as" → "term commonly used in the JavaScript ecosystem for"), fixed typo
• compiler.mdx: Made descriptions more direct ("Before starting a new compilation, you must call compiler.close() in the callback function of compiler.run and wait for it to finish. Only then can you proceed" → "Before starting a new compilation, call compiler.close() in the compiler.run callback and wait for it to finish before calling compiler.run again")
• hmr.mdx: Converted passive to active voice, clarified technical descriptions
• experiments.mdx: Standardized experimental feature descriptions ("Once enabled, Rspack will output" → "When enabled, Rspack outputs")

All changes preserve original meaning while improving readability for non-native English speakers. Spell check and formatting pass.

Original prompt

Improve the English docs in website/docs/en. Many paragraphs were
translated from Chinese and may sound unnatural.

  Rewrite sentences that don't read like authentic, professional English —
  **without changing their meaning** — so they match the tone of
  high-quality open-source docs.


  - **IMPORTANT:** Only change a sentence if it clearly improves clarity or
  correctness.

  - **IMPORTANT:** Don't alter the original meaning.

  - If you edit files in `docs/en`, check the same files in `docs/zh` to see
  if similar updates are needed.

  - Use clear, simple language for non-native English readers.

  - Keep reasonable technical abbreviations (e.g., `dev server`).

  - Use sentence case for Markdown headings.

  - Don't change more than 5 files in one PR.

  - Start PR titles with `docs:`.

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[Copilot]

Pull Request Overview

This PR improves documentation clarity and conciseness across multiple English documentation files by simplifying language, reducing wordiness, and making the content more direct and easier to understand.

• Rewrites sentences to be more concise and direct
• Converts passive voice to active voice where appropriate
• Simplifies complex sentence structures and removes redundant phrases

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
website/docs/en/guide/optimization/tree-shaking.mdx	Simplified explanations of tree shaking concepts, prerequisites, and configuration options
website/docs/en/config/experiments.mdx	Made experimental features descriptions more concise and direct
website/docs/en/config/cache.mdx	Streamlined cache configuration documentation
website/docs/en/api/runtime-api/hmr.mdx	Clarified HMR API descriptions and usage examples
website/docs/en/api/javascript-api/compiler.mdx	Improved clarity of Compiler API method descriptions

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