minor improvement


git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1564848 13f79535-47bb-0310-9956-ffa450edef68
OAK-942 : Permissions Document changes wrt Jackrabbit

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1564849 13f79535-47bb-0310-9956-ffa450edef68