ACCUMULO-958 marked incomplete WAL encrpytion feature as experimental so it will not show up in docs 

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1441504 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-958 fixed spelling, hid experimental options in shell

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1441559 13f79535-47bb-0310-9956-ffa450edef68