WP 4.0.1 readme.txt updates

git-svn-id: https://plugins.svn.wordpress.org/page-links-single-page-option/trunk@1029638 b8457f37-d9ea-0310-8a92-e5e31aec5664
WP 4.0.1 readme.txt updates

git-svn-id: https://plugins.svn.wordpress.org/page-links-single-page-option/trunk@1029640 b8457f37-d9ea-0310-8a92-e5e31aec5664