update the snippet style

git-svn-id: https://plugins.svn.wordpress.org/squirrly-seo/trunk@966198 b8457f37-d9ea-0310-8a92-e5e31aec5664
checked the compatibility with 3.9.2

git-svn-id: https://plugins.svn.wordpress.org/squirrly-seo/trunk@966199 b8457f37-d9ea-0310-8a92-e5e31aec5664