update example functions to use correct dir name

git-svn-id: https://plugins.svn.wordpress.org/cmb2/trunk@991330 b8457f37-d9ea-0310-8a92-e5e31aec5664
update example functions to use correct dir name

git-svn-id: https://plugins.svn.wordpress.org/cmb2/trunk@991333 b8457f37-d9ea-0310-8a92-e5e31aec5664