Correct Javadoc

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1558381 13f79535-47bb-0310-9956-ffa450edef68
Add support (with tests) for read-only web resource sets.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1558395 13f79535-47bb-0310-9956-ffa450edef68