Updates to the configuring and running guide

Noting some documentation updates to the configuring and running guide:https://access.redhat.com/site/documentation//en-US/JBoss_Fuse/6.0/html/Configuring_and_Running_JBoss_Fuse/files/ESBAdminServiceInstall.html1) The docs state you should only modify the generated wrapper.conf file.In the start script, there is a RUN_AS_USER environment variable. Its necessary to edit this file in order to run the service as a specific user. We should also clarify this point in the docs.2) The -s AUTO_START seems to be a specific property used when running the service in a windows environment. We should clarify this is for windows only.