Add document for Cluster Deployer.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1467891 13f79535-47bb-0310-9956-ffa450edef68
remove invalid comment.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1467893 13f79535-47bb-0310-9956-ffa450edef68