functional test: Update functional README.md

functional/README.md

@@ -24,12 +24,12 @@ And run [example scripts](./scripts).
 
 ```bash
 # run 3 agents for 3-node local etcd cluster
-./scripts/docker-local-agent.sh 1
-./scripts/docker-local-agent.sh 2
-./scripts/docker-local-agent.sh 3
+./functional/scripts/docker-local-agent.sh 1
+./functional/scripts/docker-local-agent.sh 2
+./functional/scripts/docker-local-agent.sh 3
 
 # to run only 1 tester round
-./scripts/docker-local-tester.sh
+./functional/scripts/docker-local-tester.sh
 ```
 
 ## etcd Proxy