tweak documentation

git-svn-id: https://plugins.svn.wordpress.org/bepro-listings/trunk@888318 b8457f37-d9ea-0310-8a92-e5e31aec5664
tweak documentation

git-svn-id: https://plugins.svn.wordpress.org/bepro-listings/trunk@888320 b8457f37-d9ea-0310-8a92-e5e31aec5664