Touch up javadoc across the project

git-svn-id: http://myrrix-recommender.googlecode.com/svn/trunk@626 0d189622-dca1-7e23-9e30-e8815eb7bd2f
Fix javadoc typo

git-svn-id: http://myrrix-recommender.googlecode.com/svn/trunk@627 0d189622-dca1-7e23-9e30-e8815eb7bd2f