Correct typo manually


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/kinfit@223 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Improvement of wording


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/kinfit@224 edb9625f-4e0d-4859-8d74-9fd3b1da38cb