Update 06-stream.md

docs/zh/07-develop/06-stream.md

@@ -70,7 +70,7 @@ insert into d1004 values("2018-10-03 14:38:06.500", 11.50000, 221, 0.35000);
 ### 查询以观察结果
 
 ```sql
-taos> select start, end, max_current from current_stream_output_stb;
+taos> select start, wend, max_current from current_stream_output_stb;
           start          |          wend           |     max_current      |
 ===========================================================================
  2018-10-03 14:38:05.000 | 2018-10-03 14:38:10.000 |             10.30000 |