Clarify what is meant by batch mode
Clarify what is meant by batch mode

git-svn-id: https://svn.apache.org/repos/asf/jakarta/jmeter/branches/rel-2-2@498493 13f79535-47bb-0310-9956-ffa450edef68

Former-commit-id: 5c44ba4b139880dc646a0d4eaf8252b4810ada89
apache/jmeter,ham1/jmeter,benbenw/jmeter,ham1/jmeter,etnetera/jmeter,benbenw/jmeter,apache/jmeter,apache/jmeter,etnetera/jmeter,apache/jmeter,etnetera/jmeter,benbenw/jmeter,ham1/jmeter,etnetera/jmeter,ham1/jmeter,apache/jmeter,etnetera/jmeter,ham1/jmeter,benbenw/jmeter