docs: update html template documentation

[chenjiahan]

Summary

• Improve descriptions of favicon and app icon configuration
• Replace Array<string> with string[] in type definitions for consistency
• Fix spacing and formatting

Checklist

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

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[Copilot]

Pull Request Overview

Refresh and clarify HTML template documentation across zh and en, focusing on icon configuration and consistent type annotations.

• Add code block titles for rsbuild.config.ts examples
• Clarify favicon and app icon configuration guidance
• Replace Array with string[] in type definitions

Reviewed Changes

Copilot reviewed 6 out of 15 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
website/docs/zh/guide/basic/html-template.mdx	Improves icon docs, adds code block titles, updates type annotations in examples
website/docs/zh/config/html/template-parameters.mdx	Updates array type annotations to string[]
website/docs/zh/config/html/app-icon.mdx	Adds reference link for apple-touch-icon
website/docs/en/guide/basic/html-template.mdx	Mirrors zh updates: icon docs, code block titles, type annotations
website/docs/en/config/html/template-parameters.mdx	Updates array type annotations to string[]
website/docs/en/config/html/app-icon.mdx	Adds reference link for apple-touch-icon

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