update doc to include task_mode for DaskVine (#3946)

doc/manuals/taskvine/index.md

@@ -2701,6 +2701,8 @@ The `compute` call above may receive the following keyword arguments:
 | lazy\_transfer | Whether to bring each result back from the workers (False, default), or keep transient results at workers (True) |
 | resources   | A dictionary to specify [maximum resources](#task-resources), e.g. `{"cores": 1, "memory": 2000"}` |
 | resources\_mode | [Automatic resource management](#automatic-resource-management) to use, e.g., "fixed", "max", or "max throughput"| 
+| task\_mode | Mode to execute individual tasks, such as [function calls](#serverless-computing). to use, e.g., "tasks", or "function-calls"|
+
 
 
 ### Further Information