docs: update onAttackEntity (#265)

Author: xiaoqch

docs/apis/EventAPI/PlayerEvents.md

@@ -133,7 +133,7 @@ Reminder: This event does not fire when the player returns to the Overworld from
 #### `"onAttackEntity"` - Player Attack Other Event
 
 - Listener function prototype 
-  `function(player,entity,damage)`
+  `function(player,entity)`
 - Parameters: 
   - player : `Player` 
     The player that attacked an entity.

docs/apis/EventAPI/PlayerEvents.zh.md

@@ -135,7 +135,7 @@
 #### `"onAttackEntity"` - 玩家攻击实体
 
 - 监听函数原型
-  `function(player,entity,damage)`
+  `function(player,entity)`
 - 参数：
   - player : `Player` 
     攻击实体的玩家对象