处理 mermaid 渲染无法显示下划线的问题

Author: Mq-b

md/详细分析/03async与future源码解析.md

@@ -298,25 +298,24 @@ _NODISCARD_ASYNC future<_Invoke_result_t<decay_t<_Fty>, decay_t<_ArgTypes>...>>
 
  ```mermaid
  classDiagram
-  class _Associated_state {
-  ...
-  }
+ class _Associated_state {
+ ...
+ }
  
-  class _Packaged_state {
-  -std::function _Fn
-  }
+ class _Packaged_state {
+ -std::function _Fn
+ }
  
-  class _Task_async_state {
-  -::Concurrency::task<void> _Task
-  }
+ class _Task_async_state {
+ -::Concurrency::task<void> _Task
+ }
  
- class _Deferred_async_state {
- ...
- }
+ class _Deferred_async_state {
+ }
  
-  _Associated_state <|-- _Packaged_state : 继承
-  _Packaged_state <|-- _Task_async_state : 继承
-  _Packaged_state <|-- _Deferred_async_state : 继承
+ _Associated_state <|-- _Packaged_state : 继承
+ _Packaged_state <|-- _Task_async_state : 继承
+ _Packaged_state <|-- _Deferred_async_state : 继承
  
  ```