rewrite plugin description

git-svn-id: https://plugins.svn.wordpress.org/feed-them-social/trunk@755439 b8457f37-d9ea-0310-8a92-e5e31aec5664
slite text adjustment

git-svn-id: https://plugins.svn.wordpress.org/feed-them-social/trunk@755440 b8457f37-d9ea-0310-8a92-e5e31aec5664