Clarify some sentences. Remove some misleading advices.
Clarify some sentences.
Remove some misleading advices.

git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1513109 13f79535-47bb-0310-9956-ffa450edef68

Former-commit-id: 4b47e0256b837a523d8a53d80a5a6d64956af20e
apache/jmeter,apache/jmeter,ham1/jmeter,apache/jmeter,ham1/jmeter,benbenw/jmeter,benbenw/jmeter,etnetera/jmeter,benbenw/jmeter,etnetera/jmeter,etnetera/jmeter,etnetera/jmeter,ham1/jmeter,etnetera/jmeter,apache/jmeter,benbenw/jmeter,apache/jmeter,ham1/jmeter,ham1/jmeter