chore: tweak header in zh translation

meteorlxy · meteorlxy · commit e980ab1e0dff · 2021-01-16T22:40:22.000+08:00
diff --git a/docs/zh/reference/default-theme/config.md b/docs/zh/reference/default-theme/config.md
@@ -512,7 +512,7 @@ module.exports = {
 
   它主要是为了站点的可访问性 (a11y) 。
 
-## Plugins
+## 插件
 
 ### themePlugins
 
