Improve RE docs
Improve RE docs

git-svn-id: https://svn.apache.org/repos/asf/jakarta/jmeter/trunk@890851 13f79535-47bb-0310-9956-ffa450edef68

Former-commit-id: 51e010c5b74cf30aed7949366990c9097bddd131
etnetera/jmeter,apache/jmeter,apache/jmeter,ham1/jmeter,apache/jmeter,benbenw/jmeter,etnetera/jmeter,ham1/jmeter,ham1/jmeter,etnetera/jmeter,ham1/jmeter,apache/jmeter,apache/jmeter,etnetera/jmeter,etnetera/jmeter,ham1/jmeter,benbenw/jmeter,benbenw/jmeter,benbenw/jmeter