Updated instructions

git-svn-id: https://plugins.svn.wordpress.org/page-hierarchy-plug-in/trunk@997689 b8457f37-d9ea-0310-8a92-e5e31aec5664
Clearer name

git-svn-id: https://plugins.svn.wordpress.org/page-hierarchy-plug-in/trunk@997691 b8457f37-d9ea-0310-8a92-e5e31aec5664