Add more Java sampler docs
Add more Java sampler docs

git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1380195 13f79535-47bb-0310-9956-ffa450edef68

Former-commit-id: 46562165470b77d28cf326bb82ced04ff4d5fdda
etnetera/jmeter,ham1/jmeter,ham1/jmeter,benbenw/jmeter,apache/jmeter,benbenw/jmeter,apache/jmeter,etnetera/jmeter,etnetera/jmeter,benbenw/jmeter,apache/jmeter,apache/jmeter,apache/jmeter,etnetera/jmeter,etnetera/jmeter,ham1/jmeter,ham1/jmeter,benbenw/jmeter,ham1/jmeter