Correct comment

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1576908 13f79535-47bb-0310-9956-ffa450edef68
Better Javadoc

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1576923 13f79535-47bb-0310-9956-ffa450edef68