improve javadoc

git-svn-id: https://svn.apache.org/repos/asf/tomcat/maven-plugin/trunk@1449879 13f79535-47bb-0310-9956-ffa450edef68
reduce noise when publishing doc

git-svn-id: https://svn.apache.org/repos/asf/tomcat/maven-plugin/trunk@1449881 13f79535-47bb-0310-9956-ffa450edef68