Minor text tweaks.
Minor text tweaks.

* Use words instead of numbers, when they are smaller than twelve and are used as text.
* Use GB as unit instead of g. 
* Explain the magic number of bytes for 2GB
* white-space police


git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1767142 13f79535-47bb-0310-9956-ffa450edef68

Former-commit-id: 2233bf573cf186eb09b2094a3e3a937dd7a7d0aa
ham1/jmeter,ham1/jmeter,apache/jmeter,etnetera/jmeter,apache/jmeter,benbenw/jmeter,apache/jmeter,ham1/jmeter,benbenw/jmeter,ham1/jmeter,ham1/jmeter,benbenw/jmeter,etnetera/jmeter,benbenw/jmeter,etnetera/jmeter,etnetera/jmeter,apache/jmeter,etnetera/jmeter,apache/jmeter