Some documentation changes.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nhanesaccel@75 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Mainly a date re-trigger.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nhanesaccel@76 edb9625f-4e0d-4859-8d74-9fd3b1da38cb