[Fix-18199][Doc] Fix incorrect description of Serial Discard execution strategy (#18204)

Author: ruanwenjun

docs/docs/en/guide/project/workflow-definition.md

@@ -56,7 +56,7 @@ Click the `Save` button and configure `process execution type` in the pop-up win
 
 - `Parallel`: If there are multiple instances of the same workflow definition, execute the instances in parallel.
 - `Serial Wait`: If there are multiple instances of the same workflow definition, execute the instances in serial.
-- `Serial Discard`: If there are multiple instances of the same workflow definition, discard the later ones and kill the current running ones.
+- `Serial Discard`: If there is a running instance of the same workflow definition, the later ones will be discarded; the running instance is not affected.
 - `Serial Priority`: If there are multiple instances of the same workflow definition, execute the instances according to the priority in serial.
 
 ![workflow-execution-type](../../../../img/new_ui/dev/project/workflow-execution-type.png)

docs/docs/zh/guide/project/workflow-definition.md

@@ -40,7 +40,7 @@
 - **执行策略**
 - `并行`：如果对于同一个工作流定义，同时有多个工作流实例，则并行执行工作流实例。
 - `串行等待`：如果对于同一个工作流定义，同时有多个工作流实例，则串行执行工作流实例。
-- `串行抛弃`：如果对于同一个工作流定义，同时有多个工作流实例，则抛弃后生成的工作流实例并杀掉正在跑的实例。
+- `串行抛弃`：如果对于同一个工作流定义，已有正在运行的工作流实例，则抛弃后续生成的工作流实例，正在运行的实例不受影响。
 - `串行优先`：如果对于同一个工作流定义，同时有多个工作流实例，则按照优先级串行执行工作流实例。
 
 ![workflow-execution-type](../../../../img/new_ui/dev/project/workflow-execution-type.png)