More explanation of UDVs
More explanation of UDVs

git-svn-id: https://svn.apache.org/repos/asf/jakarta/jmeter/trunk@753290 13f79535-47bb-0310-9956-ffa450edef68

Former-commit-id: c160fcc0f0e9961da63aeef42e9cd86540ebb3fb
apache/jmeter,etnetera/jmeter,etnetera/jmeter,ham1/jmeter,etnetera/jmeter,ham1/jmeter,benbenw/jmeter,ham1/jmeter,ham1/jmeter,ham1/jmeter,etnetera/jmeter,benbenw/jmeter,apache/jmeter,apache/jmeter,etnetera/jmeter,apache/jmeter,benbenw/jmeter,benbenw/jmeter,apache/jmeter