Use 'typeface style' instead of 'typeface'

[xfq]

Fix #275.

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Pull Request Overview

This pull request updates terminology in the English text from "typeface" to "font style" to align with updated style guidelines.

• Replaces "typeface" with "font style" in headings and descriptive paragraphs
• Ensures consistency in terminology across the English portions of the document

Comments suppressed due to low confidence (1)

index.html:682

• [nitpick] Confirm that 'font style' is the intended term in all relevant English contexts, as it might be interpreted differently from 'typeface' in technical settings.

        <span its-locale-filter-list="en" lang="en">Four frequently-used font styles for Chinese text</span>