Changing ip from ec2 sample

With the current IP, the sample doesn't work. However, if we changed it to 127.0.01 it works as expected.

content/en/user-guide/aws/ec2/index.md

@@ -171,7 +171,7 @@ You can now use the IP address to test the Python Web Server.
 Run the following command to test the Python Web Server:
 
 {{< command >}}
-$ curl 172.17.0.4:8000
+$ curl 127.0.0.1:8000
 {{< /command >}}
 
 You should see the following output: