docs: 给titleEn示例添加括号

[YDX-2147483647]

\BITSetup（l3keys）使用,分隔。如果标题本身就含,，必须用括号包裹，不然无法正常解析。

这并不显然。给示例加上括号，可以让一般人也能猜到。

（今天群里有人问，上学期我也被别人问过。）

Typst 的样子

charged-ieee – Typst Universe

#import "@preview/charged-ieee:0.1.3": ieee

#show: ieee.with(
  title: [A typesetting system to untangle the scientific writing process],
  abstract: [
    The process of scientific writing is often tangled up with the intricacies of typesetting, leading to frustration and wasted time for researchers. In this paper, we introduce Typst, a new typesetting system designed specifically for scientific writing. Typst untangles the typesetting process, allowing researchers to compose papers faster. In a series of experiments we demonstrate that Typst offers several advantages, including faster document creation, simplified syntax, and increased ease-of-use.
  ],
  authors: (
    (
      name: "Martin Haug",
      department: [Co-Founder],
      organization: [Typst GmbH],
      location: [Berlin, Germany],
      email: "[email protected]"
    ),
    (
      name: "Laurenz Mädje",
      department: [Co-Founder],
      organization: [Typst GmbH],
      location: [Berlin, Germany],
      email: "[email protected]"
    ),
  ),
  index-terms: ("Scientific writing", "Typesetting", "Document creation", "Syntax"),
  bibliography: bibliography("refs.bib"),
)

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