RFR(S): 8170855: Example for -Xlog:help do not contain one with multiple tags

[Marcus Larsson]

Hi,

Please review the following patch to add more use case examples in the 
-Xlog:help output.

Issue:
https://bugs.openjdk.java.net/browse/JDK-8170855

Webrev:
http://cr.openjdk.java.net/~mlarsson/8170855/webrev.00

Thanks,
Marcus