updated readme.txt 

git-svn-id: https://plugins.svn.wordpress.org/dpabottomofpostpage/trunk@988119 b8457f37-d9ea-0310-8a92-e5e31aec5664
corrected English spelling errors

git-svn-id: https://plugins.svn.wordpress.org/dpabottomofpostpage/trunk@988122 b8457f37-d9ea-0310-8a92-e5e31aec5664