Updated alert-topic-handler manual test documentation

docs/Integration---Alert-Topic-Handler.md

@@ -96,7 +96,7 @@ kapacitor show-topic-handler http_topic handler_id
 cat /var/log/alert-test.log
 ```
 
-* Tear down the test scenario by killing the http server:
+* Tear down the test scenario by killing the http server, deleting the log file and removing the alert, topic and handler:
 
 *find the PID of the http server*
 ```bash
@@ -107,3 +107,15 @@ ps -ef | grep http_server
 ```bash
 kill <PID>
 ```
+
+*remove the log file*
+```bash
+rm /var/log/alert-test.log
+```
+
+*remove the alert, handler and topic in kapacitor*
+```bash
+kapacitor delete tasks alert_id
+kapacitor delete topic-handlers http_topic handler_id
+kapacitor delete topics http_topic
+```