correct path

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

docs/nightly/en/user-guide/continuous-aggregation/manage-flow.md

@@ -40,7 +40,7 @@ AS
 SELECT count(item) from my_source_table GROUP BY tumble(time_index, INTERVAL '5 minutes');
 ```
 
-The created flow will compute `count(item)` for every 5 minutes and store the result in `my_sink_table`. All data comes within 1 hour will be used in the flow. For the `tumble()` function, refer to [define time window](./define-time-window.md) part.
+The created flow will compute `count(item)` for every 5 minutes and store the result in `my_sink_table`. All data comes within 1 hour will be used in the flow. For the `tumble()` function, refer to [define time window](/define-time-window.md) part.
 
 # Delete flow