Add note that filter language can work in shell too

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1462317 13f79535-47bb-0310-9956-ffa450edef68
HBASE-7977 Online merge should acquire table lock

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1462385 13f79535-47bb-0310-9956-ffa450edef68