Documentation update

git-svn-id: https://plugins.svn.wordpress.org/google-universal-analytics/trunk@943428 b8457f37-d9ea-0310-8a92-e5e31aec5664
Documentation update

git-svn-id: https://plugins.svn.wordpress.org/google-universal-analytics/trunk@943430 b8457f37-d9ea-0310-8a92-e5e31aec5664