发现中文文档错别字

文件位于：/docs/coding/html.zh.md

HTML 元素必须有 lang 属性

等级：强制 lang 属性有助于搜索**殷勤**，屏幕阅读器、翻译工具的正常工作。属性的值通常是 语言-地区 格式，如 en-US, zh-CN。

搜索**殷勤** --> 搜索引擎

Open /docs/coding/html.zh.md and locate the section stating that HTML elements must have a lang attribute. Check the two occurrences of “殷勤” in the explanation and search note; done means the intended wording is “搜索引擎” and the surrounding Chinese text remains unchanged.

Written by the indexing model from the issue text.