Clarify that the manager app is already installed. Remove adding entry to server.xml as an installation option.
Clarify that the manager app is already installed. Remove adding entry to server.xml as an installation option.

git-svn-id: 40f70788afc64a734d8b91520bec53ae21e7042f@556767 13f79535-47bb-0310-9956-ffa450edef68

apache/tomcat,apache/tomcat,apache/tomcat,Nickname0806/Test_Q4,Nickname0806/Test_Q4,apache/tomcat,apache/tomcat,Nickname0806/Test_Q4,Nickname0806/Test_Q4