For https://issues.apache.org/bugzilla/show_bug.cgi?id=56530
Correct a typo. Reorder sentences and split into two paragraphs. (Review of r1623360.)

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1623839 13f79535-47bb-0310-9956-ffa450edef68