Update test document by changing "TIMEOUT" to "TIMEOUT_FACTOR"

[Wang Xue]

Hi all,

The test document has not been updated completely when changing 
"TIMEOUT" to "TIMEOUT_FACTOR" (JDK-8217634).

It needs to be updated.


Bug: https://bugs.openjdk.java.net/browse/JDK-8230079

Webrev: http://cr.openjdk.java.net/~aoqi/8230079/webrev.00/


Could you please review it?


Thanks,

Wang Xue