Fix typo in method name

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1613037 13f79535-47bb-0310-9956-ffa450edef68
OAK-1988: Confusing debug message about old revision access

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1613041 13f79535-47bb-0310-9956-ffa450edef68