docs: improve English clarity in documentation files

[Copilot]

Overview

This PR improves the English quality in 9 documentation files under website/docs/en. Many paragraphs were translated from Chinese and contained unnatural phrasing that didn't match the tone of professional open-source documentation.

Changes Made

Style Improvements

• Removed overly formal phrases: Changed "please refer to" → "refer to", removed unnecessary "just" and "please"
• Improved preposition consistency: Changed "accessed via" → "accessed at" for consistency throughout
• Simplified verb constructions: Changed "will automatically" → "automatically" where appropriate
• Made instructions more direct: Replaced wordy phrases with clearer alternatives (e.g., "you can use the following method to introduce" → "you can use the following approach to integrate")
• Enhanced readability: Removed redundant words while preserving all technical information

Files Modified

1. config/server/open.mdx - Simplified browser configuration descriptions
2. guide/basic/server.mdx - Improved server configuration and middleware integration sections
3. guide/advanced/env-vars.mdx - Enhanced clarity in environment variable usage and define explanation
4. config/source/define.mdx - Refined main description
5. guide/start/index.mdx - Improved feature descriptions and comparisons with other tools
6. guide/advanced/hmr.mdx - Made file watching section more concise
7. guide/basic/static-assets.mdx - Enhanced readability of asset handling descriptions
8. guide/faq/general.mdx - Made FAQ answers sound more natural
9. config/dev/watch-files.mdx - Enhanced clarity throughout configuration descriptions

Examples

Before:

server.open is used to configure a set of page URLs that Rsbuild will automatically open in the browser after starting the server.

After:

server.open configures which page URLs Rsbuild should automatically open in the browser after starting the server.

Before:

By default, Rsbuild will automatically set the process.env.NODE_ENV environment variable to 'development' in development mode

After:

By default, Rsbuild sets the process.env.NODE_ENV environment variable to 'development' in development mode

Quality Assurance

• ✅ All changes preserve original meaning and technical accuracy
• ✅ No code examples, configuration values, or technical terms were altered
• ✅ Changes use clear, simple language appropriate for non-native English readers
• ✅ Documentation now matches the tone of high-quality open-source projects like React, Vue, and Vite

Stats: 9 files changed, 94 insertions(+), 94 deletions(-)

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 10 files in one PR.
• Start PR titles with docs:.

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