[docs] 将 TempCommandSender 替换为 GroupTempCommandSender (#2457)

根据后文代码注释'mirai 正计划支持其他渠道发起的临时会话, 届时此事件会变动. 原 TempCommandSender 已更改为 GroupTempCommandSender'修改。

Author: char-46

mirai-console/backend/mirai-console/src/command/CommandSender.kt

@@ -134,11 +134,11 @@ import kotlin.coroutines.CoroutineContext
  *                                   |                      +------+------------+---------------+                     |
  *                                   |                             |                            |                     |
  *                                   |                             |                            |                     |      }
- *                           FriendCommandSender          MemberCommandSender           TempCommandSender             |      } 二级子类
+ *                           FriendCommandSender          MemberCommandSender         GroupTempCommandSender          |      } 二级子类
  *                                   ↑                             ↑                            ↑                     |      }
  *                                   |                             |                            |                     |
  *                                   |                             |                            |                     |      }
- *                      FriendCommandSenderOnMessage  MemberCommandSenderOnMessage  TempCommandSenderOnMessage        |      } 三级子类
+ *                      FriendCommandSenderOnMessage  MemberCommandSenderOnMessage  GroupTempCommandSenderOnMessage   |      } 三级子类
  *                                   |                             |                            |                     |      }
  *                                   |                             |                            |                     |
  *                                   +-----------------------------+----------------------------+---------------------+