LOG4J2-141 improved documentation regarding log4j status logger

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1604173 13f79535-47bb-0310-9956-ffa450edef68
LOG4J2-141 improved documentation regarding log4j status logger

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1604175 13f79535-47bb-0310-9956-ffa450edef68