Fix typo in comments of the etc/org.apache.karaf.log.cfg file

git-svn-id: https://svn.apache.org/repos/asf/karaf/trunk@1546731 13f79535-47bb-0310-9956-ffa450edef68
Fix typo and link in the manual

git-svn-id: https://svn.apache.org/repos/asf/karaf/trunk@1546732 13f79535-47bb-0310-9956-ffa450edef68
[KARAF-2511] Review the log page of the documentation
[KARAF-2381] Update the document of the log:set command and the DEFAULT keyword

git-svn-id: https://svn.apache.org/repos/asf/karaf/trunk@1546733 13f79535-47bb-0310-9956-ffa450edef68