Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=54931
Add information on creating multiple services.
Based on a patch by Chris Derham

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1486835 13f79535-47bb-0310-9956-ffa450edef68