update readme

Signed-off-by: Tihomir Surdilovic <[email protected]>

Author: tsurdilo

core/src/main/java/io/temporal/samples/packetdelivery/README.md

@@ -8,7 +8,10 @@ Workflow waits until all packets have been delivered. Each packet delivery path
 also "cancel" delivery of another item. This is done via signal and cancellation of the 
 CancellationScope. 
 
-2. Start the Sample:
+## Start the Sample:
 ```bash
 ./gradlew -q execute -PmainClass=io.temporal.samples.packetdelivery.Starter
-``
+``
+
+Run sample multiple times to see different scenarios (delivery failure and retry and delivery cancelation)
+There is a 10% chance delivery is going to be canceled and 20% chane it will fail.