docs: fix wrong text in code-splitting.mdx

Author: strugglinglee

src/content/guides/code-splitting.mdx

@@ -45,7 +45,7 @@ related:
     url: https://medium.com/webpack/link-rel-prefetch-preload-in-webpack-51a52358f84c
   - title: Chrome 中的预加载、预获取和优先级(Preload, Prefetch And Priorities)
     url: https://medium.com/reloading/preload-prefetch-and-priorities-in-chrome-776165961bbf
-  - title: 使用用 <link rel="preload" /> 预加载内容
+  - title: 使用 <link rel="preload" /> 预加载内容
     url: https://developer.mozilla.org/en-US/docs/Web/HTML/Preloading_content
 ---