📝 update handler doc

website/docs/advanced/di/dependency-injection.md

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-sidebar_position: 3
+sidebar_position: 1
+description: 依赖注入简介
 
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-    weight: 62
+    weight: 60
     category: advanced
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-# 依赖注入
+# 简介
 
 受 [`FastApi`](https://fastapi.tiangolo.com/tutorial/dependencies/) 启发，NoneBot 同样编写了一个简易的依赖注入模块，使得开发者可以通过事件处理函数参数的类型标注来自动注入依赖。
 

website/docs/advanced/di/overload.md

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-sidebar_position: 2
+sidebar_position: 3
+description: 重载事件处理函数
 
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-    weight: 61
+    weight: 62
     category: advanced
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website/docs/advanced/di/sync-support.md

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-sidebar_position: 1
+sidebar_position: 2
+description: 同步函数作为依赖
 
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   menu:
-    weight: 60
+    weight: 61
     category: advanced
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website/docs/advanced/unittest.md

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+---
+description: 编写单元测试
+
+options:
+  menu:
+    weight: 80
+    category: advanced
+---
+
+# 单元测试